List of file formats (alphabetical)

This alphabetical list of filename extensions contains standard extensions associated with computer files.

Contents
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
#   Sym 

Sym

Ext. Description Used by
###
Temporary file program-dependent format
#24
Printer data file for 24 pin matrix printer LocoScript
#IB
Printer data file LocoScript
#nn
Part of file image Long
#SC
Printer data file LocoScript
#ST
Standard mode printer definitions LocoScript
$$$
OS/2 archive file (i.e. archives.$$$, keys.$$$) OS/2
$$$
Temporary file
$?
ZX Spectrum file in HOBETA format
$00
Pipe file DOS
$DB
Temporary file dBASE IV
$ED
Editor temporary file MS C
$O1
Pipe file DOS
$VM
Virtual manager temporary file Windows 3.x
)2(
LHA archiver temporary file LHA
 ??$
Backup file P-CAD
 ??_
Microsoft packed file Expand
 ?DK
Disk image Loaddskf.exe
 ?UT
Nonpacked FTN mail (? - flavor) FTN software
 !ut
Unfinished µTorrent download µTorrent
___
Adinf table Adinf
EX_
Compressed executable file Note: EX could be any first two characters in a file extension (e.g. BM_ for compressed bitmap (BMP), DL_ for compressed library, etc.) Files compressed using this method have been in use on Microsoft software CDs and floppies since around 1995.
 ?Q?
Squeeze for CP/M and MS-DOS
~$~
Temporary file 1st Reader
~??
Old Backup files (.MNU to .~MN) Resource Workshop - Borland Delphi
~H
Cardfile heap AZZ Cardfile
μ
Metrowerks Codewarrior project
Π
THINK C project
@@1, @@2, etc.
Hidownload temporary file Hidownload

#

Ext. Description Used by
0
Compressed harddisk data DoubleSpace
0B
Printer font with lineDraw extended character set PageMaker
1337
Kiwi's RTCoD File Format Se7ensins & Teh1337
001, 002, ...
Split parts of a single whole file FFSJ, HJSplit, JJSplit, split (Unix) (when using numeric suffixes)
1
Fax many
1
Roff/nroff/troff/groff source for manual page cawf2.zip
123
Spreadsheet Lotus 1-2-3 version 9 - Lotus 1-2-3 version 97
15U
Printer font with PI font set PageMaker
1ST
Usually README.1ST text file
1TX
1toX Logipole file
2GR
286 Grabber File Win
301
Fax Super FAX 2000 - Fax-Mail 96
386
Intel 80386 processor driver Windows 3.x
386
Windows virtual device driver Win
3DMF
QuickDraw 3D Metafile QuickDraw
3DS
3D Studio Graphics format 3D Studio
3DT
Database in which the meta-data of a 3D Topicscape is held 3D Topicscape
3DV
3-D wireframe graphics by Oscar Garcia 3dv wireframe viewer
3FX
Effect CorelChart
3GA
Mobile Phone Audio (Samsung)
Mobile Phone Video
3GR
386 Grabber File Win
3T4
Binary file converter to ASCII Util3
4C$
Datafile 4Cast/2
4MD
Musical file
4SW
4DOS Swap File 4DOS
4TH
FORTH source code file ForthCMP - LMI Forth
555
16 bit per pixel image file format (5bit per component) Sierra Entertainment
602
Text (fairly simple format - plain text with binary control commands embedded within text lines and special formatting commands on dedicated lines) Text602 text processor by Software602
668
Music (the mixing is always at 12048 Hz)
669
Music (8 channels) The 669 Composer
6CM
Music (6 Channel Module) Triton FastTracker
75
75×75 dpi display font Ventura Publisher
7z
7-Zipped file
8
A86 assembler source code file
85
85×85 dpi display font Ventura Publisher
8BF
Adobe Photoshop compatibile filters/plugins
890
ScanTitling subtitle files
8CM
Music (8 Channel Module) Triton FastTracker
8M
Printer font with Math 8 extended character set PageMaker
8U
Printer font with Roman 8 extended character set PageMaker
83p
Executable program for TI-83 Plus Graphing Calculator TI Connect
89p
Executable program for TI-89/89 Titanium Graphing Calculator TI Connect
8xp
Executable program for TI-83/84 Plus Graphing Calculator TI Connect
91
91×91 dpi display font Ventura Publisher
96
96×96 dpi display font Ventura Publisher

A

Ext. Description Used by
A
ADA source code file
A
Library Unix
A##
AlZip Compressed Files' pieces
A11
Graphics AIIM image file
A80
Assembler language source for 8080
AA, AB, ...
Split parts of a single whole file split (Unix)
AAC
Advanced Audio Coding is a standardized, lossy compression and encoding scheme for digital audio.
AAF
AutoPatcher file
AAF
Advanced Authoring Format is an advanced media wrapper file for professional applications.
AAS
Animation Play Script AAPlay
AB6
Datafile ABStat
AB8
Datafile ABStat
ABC
Document ABC FlowCharter 1.0
ABP
Data ABComp compressed
ABP
AVS Barcode Profile AVS Barcode Source
ABF
Adobe Binary Screen Font Adobe Systems Software
ABK
Automatic backup file CorelDRAW
ABM
Image PALS album file
ABM
Album file (various programs)
ABR
Adobe Brush file for PhotoShop PhotoShop
ABS
Abstracts (info file)
ABS
Data file Abscissa
AC
Project backup Audit Command Language (ACL)
ACA
Project Project Manager Workbench
ACB
Archive ACB
ACB
see ACMB
ACC
Program (DR-DOS - ViewMax) GEM / resident
ACCDA
Data Microsoft Access Database Wizard (Open XML)
ACCDB
Data Microsoft Access Database (Open XML)
ACCDE
Data Microsoft Access Database Wizard (Open XML)
ACCDT
Data Microsoft Access Database Template (Open XML)
ACCDU
Data Microsoft Access Database Wizard (Open XML)
ACE
Archive ACE
ACF
Adobe Custom Filter for PhotoShop PhotoShop
ACL
Project Audit Command Language (ACL)
ACL
AutoCorrect List Microsoft Office
ACM
Audio Compression Module add-on Win
ACMB
Graphics file
ACO
Adobe Color Palette
ACT
ACTOR source code file ACTOR
ACT
Animations Works Actor (Graphics cell) Animation Works
ACT
FoxDoc Action Diagrams FoxPro
ACT
Presentation Action!
AfterDark screensaver module AfterDark
AD2
ADPCM 2-bit compressed voice file ZFAX
AD3
ADPCM 3-bit compressed voice file ZFAX
ADA
Ada source code file
ADB
Ada Package Body
ADC
Bitmap graphics (16 colors) Scanstudio
ADC
Dictionary Lingvo
ADD
OS/2 adapter device driver
ADF
Amiga Disk File unADF, UAE, WinUAE etc...
ADG
Data ADG 3D Scene
ADI
Graphics file AutoCAD
ADI
Database Index File Advantage Database Server
ADICHT
LabChart data acquisition file ADInstruments
ADL
MCA adapter description library QEMM
ADM
After Dark support file AfterDark
ADM
ADEM file format ADEM
ADI
Database Memo File Advantage Database Server
ADN
Add-in Lotus 1-2-3
ADR
After Dark support file AfterDark
ADS
Ada Package Specification
ADT
WoW geographical map location file Blizzard Entertainment games (various)
ADT
Datafile for cardfile application HP NewWave
ADT
Dictionary Lingvo
ADT
Fax AdTech
ADI
Database Table Advantage Database Server
ADV
GUS device driver Gf166.com
ADX
Document Archetype Designer
ADZ
Amiga Disk Zipped (See Amiga Disk File) GZip
AEP
After Effects Project File Adobe After Effects
AF2
Flowchart ABC FlowCharter 2.0
AF3
Flowchart ABC FlowCharter 3.0
AFI
Truevision bitmap graphics
AFL
Font file (for Always) Lotus 1-2-3
AFM
Datafile for cardfile application HP NewWave
AFM
Type 1 font metric ASCII data for font installer ATM - many
AFP
Shape palette ABC FlowCharter
AFT
Template ABC FlowCharter 3.0
AFW
Workplace ABC FlowCharter 3.0
AGR
ArcView ASCII grid
AHK
AutoHotkey script file AutoHotkey
AI
Vector graphics file Adobe Illustrator
AIF
see AIFF
AIFC
Audio Interchange File Format with Compression
AIFF
Audio Interchange File Format Convert (c) Villena
AiM
Asm Text Mode Image File The Ultimate Draw
AIN
Archive AIN
AIN
Job schedule AutoIntern
AIO
APL programming language file transfer format file
AIR
Adobe AIR installation package The Adobe AIR runtime environment.
AIS
Array of Intensity Samples graphics file Xerox
AIX
Datafile for cardfile application HP NewWave
AKM
"Akai Multitimbral" sample information file Akai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers
AKP
"Akai Program" sample information file Akai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers
ALC
Molecular coordinates Alchemy, RasMol
ALG
Activity Log ARCSOLO
ALE
Avid Log Exchange (used in film & video editing) Avid
ALL
Arts & Letters symbol and font files Arts & Letters
ALL
Filelist w/ all files FRQView
ALL
Format file for working pages Always
ALL
General printer information WordPerfect for Win
ALO
Almanac support file
ALT
Menu file WordPerfect Library
ALZ
AlZip Compressed Files
AMD
Maxum chromatograph offline database Siemens Maxum Chromatograph
AMF
Music (Advanced Module Format) DMP
AMG
Archive AMGC
AMG
System image file ACTOR
AML
AutomationML AutomationML Group
AMR
Audio format for mobile phones (Nokia, SonyEricsson)
AMS
Adobe Monitor Setup calibration file PhotoShop
AMS
Music format
ANI
Animation cursors for Win Win95 - WinNT
ANI
Animation IconAuthor
ANM
Animation Deluxe Paint Animator
ANN
Help Annotations Windows 3.x
Ann
Multi volume ARJ archive ARJ
ANS
ANSI character graphics (animation) file ANSView
ANS
ASCII text ANSI character set NewWave Write
AOL
America On-line for Windows DLL Win
AOS
Add-On Software Nokia 9000
AP
Archive WHAP
AP
Datafile Datalex EntryPoint 90
APC
Printer driver Lotus 1-2-3
APD
Printer driver Lotus 1-2-3
APE
Monkey's Audio (Lossless) audio media players
APF
Printer driver Lotus 1-2-3
API
Adobe Printer Ink file for PhotoShop PhotoShop
API
Passed parameter file 1st Reader
API
Printer driver Lotus 1-2-3
APL
APL work space format file
APL
Support module used by Manugraphics APL products
APL
EV-Dos Application File
APM
Authorware Macintosh Authorware
APP
Add-in application file Symphony
APP
Application object file dBASE Application Generator
APP
Application FoxPro
APP
Application and Application Bundle Mac OS X
APP
Executable workflow / macro file Automator
APP
Executable application file DR-DOS - NeXTstep - Atari
APP
Generated application FoxPro
APR
Employee performance review Employee Appraiser
APW
Authorware Windows Authorware
APX
Appexpert database file Borland C++ 4.5
AR
Argon - for 3D Modeling Ashlar-Vellum
AR7
Archive AR7
ARC
Archive ARC - PKARC/PKXARC - PKPAS - PKUNPAK - QUARK
ARC
Archive SQUASH
ARC
Nintendo proprietary archive format Various Nintendo games
ARD
Map Holux - Alan
ARF
Automatic Response File
ARH
Archivers definitions file DN
ARI
Archive ARI
ARJ
Archive ARJ - ARJZ
ARK
ARC archive CP/M port of ARC file archiver
ARK
Archive QUARK
ARK
Managing your Money Archive File
ARR
Arrangement Atari Cubase
ART
Gerber artwork Cadence Allegro
ART
First Publisher, Designworks, Greenstreet Draw graphic file All GST/Greenstreet Draw products
ART
Graphics (scrapbook) Art Import
ART
Graphics format (Another Ray Tracer) PFS:1st publisher - Art Import
ARTX
file format Artisteer
ARTX
file format belightsoft Text Art
ARX
Archive ARX
ASC
ASCII text file
ASC
Transport armor file PGP
ASD
Autosave file Microsoft Word
ASD
Presentation Astound
ASD
Screen driver Lotus 1-2-3
ASD
Spectral Data Set ASD Inc. RS3 spectral acquisition program
ASE
Velvet Studio Sample AWAVE
ASE
ASCII Scene Export 3D Studio
ASF
Datafile STATGRAPHICS
ASF
Screen font Lotus 1-2-3
ASF
Advanced Streaming Format (Compressed Windows audio/video) Microsoft Corporation
ASK
SYSGEN answer file RT-11
ASH
Assembly language header file TASM 3.0
ASI
ASIC language source ASIC
ASI
Assembler include file Turbo C - Borland C++
ASM
Assembler language source TASM, MASM, NASM, Yasm, FASM
ASMX
ASP.NET Web Service Microsoft Corporation
ASO
Assembler object (object-oriented) file Turbo Assembler
ASP
ASPECT source code file Procomm Plus
ASP
Association of Shareware Professionals OMBUDSMN.ASP notice
ASP
Active Server Pages of Microsoft.Net Microsoft Corporation
ASPX
ActiveX Server Pages of Microsoft.Net Microsoft Corporation
ASS
Amalgam Scene Specification Halo 2 Map Editor
ASS
Advanced SubStation Alpha (Subtitles)
AST
Adobe Color Separation table for PhotoShop PhotoShop
AST
Nintendo proprietary music streaming format Various Nintendo games
ASV
Autosave File MATLAB
ASW
Authorware Star Authorware
ASX
Advanced Stream Redirector file, redirects to an ASF file (see ASF) Microsoft Corporation
ASZ
Skin AltDesk
AT2
Auto template Aldus Persuasion 2.0
AT3
Atrac 3 Sound/music file All Sony devices and programs with the Atrac 3+ specification
ATM
Adobe Type Manager data/info
ATN
Adobe Photoshop action Adobe Photoshop
ATT
AT&T Group GCGW
ATY
Produced when an association type is exported by 3D Topicscape 3D Topicscape
AU
Sun/NeXT/DEC Audio file AWAVE, GoldWave
AU
Sound (audio) file Sun Microsystems - Convert (c) Villena
AUD
Audio file AudioRack
AUP
Audacity project file Audacity
AUX
Auxiliary dictionary ChiWriter
AUX
Auxiliary references TeX/LaTeX
AUZ
Ableton Live File Authorization File for Ableton Live
AVA
Publication Avagio
AVB
AntiViral Toolkit Pro Bases
AVI
Audio Video Interleaved animation file Video for Windows
AVR
Audio Visual Research AWAVE
AVS
Audio Video Software AVS Video Editor (video editing software)
AVT
AVATAR-coding files A3E
AW
Text file HP AdvanceWrite
AWA
Animations Works Accelerated Movie Animation Works
AWD
Microsoft Fax At Work Document Microsoft Fax At Work
AWK
AWK script/program
AWM
Animations Works Movie (as .AVI) Animation Works
AWS
Data STATGRAPHICS
Ax
Directshow filter file format
AXF
ARM Executable Image generated by the ARM tools.
AXM
Axmedis object Axmedis Tools
AZD
Amazon Software Download Amazon Software Download
AZW
DRM enabled eBook All models of Amazon Kindle
AZW1
DRM enabled eBook with embedded fonts All models Amazon Kindle
AZW2
Program file All models of Amazon Kindle excluding Kindle 1
AZZ
Data file AZZ Cardfile

B

Ext. Description Used by
B&W
Black and white graphics file atari - mac
B&W
Mono binary screen image 1st Reader
B
Batch list APPLAUSE
B
Grand Theft Auto saved game Any of the 3D Grand Theft Auto games in either III or IV era.
B_W
Black and white graphics file Atari - mac
B1N
Both mono and color binary screen image 1st Reader
B30
Printer font (JLaser - Cordata) Corel Ventura Publisher
B3D
Blitz3D files
B8
Raw graphics file (one byte per pixel) plane two PicLab
BA
Binary Archive Scifer Archiver and Compression [External Header Mode]
BAC
Compiled BASIC RT-11 BASIC-11
BAD
Bad file Oracle Corporation - many
BAD
Animation file Novalogic
BAD
File which covers bad blocks on disk volume (not to be moved) RT-11
BAK
Backup file
BAL
Music score Ballade
BALANCE
Balance accounting sheet file Balance
BAP
Blaze Audio Wave Information File BlazeAudio MadCap Software
BAR
Horizontal bar menu object file dBASE Application Generator
BAR
Info Bar for GFX2EXE GFX2EXE
BAR
Broker Archive. Compressed file containing number of other files for deployment.[1] IBM WebSphere Message Broker
BAS
BASIC language source QuickBASIC - GW-BASIC - FreeBASIC
Batch file MS-DOS, RT-11
BB
Database backup Papyrus Design Group
BBL
Bibliographic reference file TeX/BibTeX
BBM
Brush Deluxe Paint
BBP
Playlist BassBox
BBQ
BitBeamer Transfer Queue file BitBeamer
BBS
Bulletin Board System announce or text info file
BBS
Hudson-style messagebase FTN software
BC!
Unfinished download Unfinished BitComet download (a BitTorrent client)
BCF
Card data Bingo Card Creator
BCH
Batch process object file dBASE Application Generator
BCH
Datafile Datalex EntryPoint 90
BCO
Outline font description Bitstream Inc.
BCP
Borland C++ makefile
BCT
Backup dictionary Clarion
BCW
Environment settings Borland C++ 4.5
BDB
Bookends database Bookends
BDC
Dictionary Lingvo
BDEF
Builder Definition Websphere Portlet Factory
BDF
Adobe Glyph Bitmap Distribution Format Adobe Software
BDF
Binary update file BUPDATE.EXE (c) TNT Techn.
BDF
Bitmap Distribution Format font file X11
BDF
Datafile Egret
BDM
Videoclip AVCHD
BDMV
Blu-ray Video Data Content file Media players / software that supports Blu-ray structure
BDR
Border Microsoft Publisher
BDT
Dictionary Lingvo
BEF
Bleck Encrypted File
BEZ
Outline font description Bitstream
BF
Brainfuck sourcefile
BF2
Bradford 2 font
BFC
Briefcase Win95 Win95
BFM
Font metrics unix/Frame
BFX
Fax BitFax
BGA
Bitmap graphics
BGI
Borland Graphics Interface device driver Turbo C - Turbo Pascal
BH
Blackhole data compression format
BI
BASIC include file Visual Basic - FreeBASIC
BIB
Bibliography (ASCII)
BIB
Database - not compatible with TeX format Papyrus
BIB
Literature database TeX/BibTeX
BIF
Binary Image Format b&w graphics file Image Capture board
BIK
Bink video file (RAD Video)
Binary file, usually zero-start (.com analog)
BIN
SGI Powerflip
BIN
Text mode memory dump The Draw - TUD - ACiDDraw - etc.
BIO
BioniX Wallpaper playlist file BioniX Wallpaper Changer
BIO
OS/2 BIOS
BIT
Bitmap X11
BK!
Document backup WordPerfect for Win
BK
Faxbook JetFax
BK?
Backup file
BKC
Backup catalog Backup4all
BKn
Timed backup file for document window n WordPerfect for Win
BKP
Backup file Write - TurboVidion DialogDesigner
BKW
Mirror image of font set FontEdit
BLD
BLoaDable picture BASIC
BLD
SYSGEN Build procedure file RT-11
BLEND
Blender3D Project File Blender
BLG
Backup Log ARCSOLO
BLK
Temporary file WordPerfect for Win
BLOB
Unknow Steam_(software) for Win
BLP
Blizzard Game Picture Blizzard Entertainment games (various)
BM
BitMap graphics file
BM3
UIQ3 Phone backup
BMD
Nintendo proprietary 3D model file Various Nintendo games
BMK
Help Bookmarks Windows 3.x
OS/2 or Win graphics format (BitMap Picture) QPeg - CorelDraw - PC Paintbrush - many
BMPW
bitmap world-file - geo-references info
BMS
Nintendo proprietary MIDI tracker format Various Nintendo games
BMT
Ami Pro Button Ami Pro
BNA
Data Atlas Boundary
BNK
Adlib instrument bank file
BNR
Graphics Banner Banner - Poster
BOK
Shamela Library book Shamela Library Program
BOO
Book-format READIBM
BOO
Compressed file ASCII archive created by BOO (msbooasm.arc) msbooasm.arc
BOO
Boo programming language source file. Boo Programming Language
BOT
Bot files, these go with JKB files Quake 3 Engine
BPC
Chart Business Plan Toolkit
BPOLY
Data Prisms binary 3D object
BPP
Backup application Clarion
BPT
Bitmap fills file CorelDRAW
BR
Script Bridge
BRD
Eagle Layout File
BRD
Tanzzle board file Tanzzle
BRD
Cadence Allegro board file Cadence
BRF
Braille Braille embossers and refreshable displays
BRK
Fax Brooktrout Fax-Mail
BRK
The Brake! Mailer REXX script The Brake!
BRL
CAD Ballistic Research Laboratory CAD
BS2
Archive BS2.EXE
BSA
Archive BSArc
BSC
Compressed Apple II file archive created by BINSCII BINSCII
BSC
Database Source Browser
BSC
Pwbrmake object file Microsoft Fortran
Half-Life\Half-Life 2 map files Valve Corporation
BSS
Casio Phone base PC-LINK
BST
BiblioTex file (BiblioTex=bibliography file) TeX
BSY
Busy flag FTN soft
BTM
Batch-to-memory (quick batch) 4dos -ndos
BTN
Makeover Button file
BUFR
Binary Universal Form for the Representation of Meteorological Data
BUG
Bugs and Problems
BUN
LucasArts Bundle File
BUP
Backup file
BUT
Button definitions Buttons!
BUY
Datafile format movie
BVn
Overflow file below insert point in Doc n WordPerfect for Win
BWB
Spreadsheet application Visual Baler
BWR
Beware (buglist) Kermit
BYU
BYU Movie BYU
BZ2
Archive bzip2
BZM
Map Blitzkrieg

C

Ext. Description Used by
C--
C—language source Sphinx C--
C
C language source

Note that on case sensitive platforms like Unix and with the gcc compiler the uppercase .C extension indicates a C++ source file.

Watcom C/C++, Borland C/C++, gcc and other C compilers
C
Unix file archive COMPACT
C++
C++ language source
C00
Print file Ventura Publisher
C01
Typhoon wave files AWAVE
C86
C source code file Computer Innovation C86
CA
Initial cache data for root domain servers Telnet
CA?
Borland packed and split file Borland Installer
CAB
Win 95 packed file Win 95
CAC
dBASE IV executable when caching on/off (see cachedb.bat)
CAD
Drawing BobCAD-CAM
CAD
Document Drafix Windows CAD
CAL
Calendar file Windows 3.x
CAL
Spreadsheet format SuperCalc
CALS
Computer Aided Acquisition and Logistics
CALS
Support Raster Format
CAM
Casio Camera
CAN
Fax Navigator Fax
CAP
Caption Ventura Publisher
CAP
Capture file ProComm - Telix
CAS
C + ASM language source Turbo C
CAT
Catalog CP Backup - dBASE IV
CAT
Device driver digital signature Microsoft Windows
CAT
Stellarium Star Catalogue Stellarium
CATDrawing
Drawing file of CATIA V5 CATIA V5
CATPart
Part file of CATIA V5 CATIA V5
CATProduct
Assembly file of CATIA V5 CATIA V5
CATS
Combined source ATS
CBA
Source code Creative BASIC
CBC
Fuzzy logic system CubiCalc
CBL
COBOL source code file
CBM
Compiled bitmap graphics XLib
CBR
Comic Book Reader (RAR file) CDisplay and similar
CBS
MasterWord button bar configuration file
CBT
Computer Based Training many
CBZ
Comic Book Reader (ZIP file) CDisplay and similar
CC
C++ source code file
CC
CC language source CC
CCC
Bitmap graphics (native format) Curtain Call
CCF
Communications configuration file Symphony
CCF
Color Chat file Color Chat File
CCH
Chart CorelChart
CCITT
CCITT Group 3 and Group 4 Encoding
CCL
Communication Command Language file Intalk
CCO
BTX Graphics file XBTX
CCT
Print Template BobCAD-CAM
CD
CD description DN
CDA
CD-Audio Win95
CDB
Card database CardScan
CDB
Main database TCU Turbo C Utilities
CDF
Common Data Format
CDF
Company Data File Nominal Small Business Accounting software
CDF
Computable Document Format Mathematica
CDF
Cyberspace Description Format
CDF
Graphics netcdf
CDK
Document Atari Calamus
CDL
CADKey CADL Language CADKey
CDM
Disk Drivers NPA Novell NetWare
CDM
Music format (compressed)
CDR
Vector graphics format (drawing) CorelDraw!
CDT
Corel Draw Template File CorelDraw!
CDX
Compound index file Visual FoxPro, Advantage Database Server
CE
Computer Eyes Conversion Artist
CE
Main.ce The FarSide Computer Calendar
CEB
Cont. Edge Bitmap Conversion Artist
CEF
CA-Clipper Workbench Application CA Clipper
CEF
Export File
CEF
Compact Embedded Font Adobe Illustrator
CEG
Bitmap graphics Tempra Show - Edsun Continuous Edge Graphics
CEL
Animation CEL 3D Studio
CEL
Graphics Autodesk Animator - Lumena
CF
Configuration file imake
CFA
Audio file Adobe Premiere Pro
CFC
ColdFusion Component Adobe ColdFusion
CFG
Configuration file
CFL
Chart CorelFLOW
CFM
ColdFusion Markup Language Adobe ColdFusion
CFN
Font data Atari Calamus
CFO
C Form Object internal format object file TCU Turbo C Utilities
CFP
Fax The Complete Fax Portable
CFT
CFast graphics file Disney Animation Studio
CGA
CGA display font Ventura Publisher
CGI
Common Gateway Interface script
CGM
Computer Graphics Metafile vector graphics A&L - HG - many
CH
Clipper language header CA Clipper
CH3
Chart Harvard Graphics 3.0
CH4
Presentation Charisma 4.0
CHD
Font descriptor FontChameleon
CHI
ChiWriter Document ChiWriter - Chiview
CHK
Recovered data DOS CHKDSK
CHK
Temporary file WordPerfect for Win
CHL
Configuration History Log
Compiled Help File Microsoft Windows, Help Explorer Viewer
CHML
Encrypted Data File Krasbit Technologies, Chameleon Imaging Workflow Software
CHN
Data Ethnograph 3
CHP
Chapter file Ventura Publisher
CHR
Character set Turbo C - Turbo Pascal
CHT
Chart Harvard Graphics 2.0 - SoftCraft Presenter
CHT
CHeaT in any program/game many
CHT
Interface file for ChartMaster dBASE
CHZ
Archive CHARC
CIF
Caltech Intermediate Format graphics file
CIF
Chapter information Ventura Publisher
CIF
Crystallographic Information File RasMol, Jmol
CiM
C Text Mode Image File The Ultimate Draw
CIX
Database index TCU Turbo C Utilities
CKB
Borland C++ 4.x editor keystroke mapping BCW.EXE
CL
COMMON LISP source code file
CLA
Source Clarion
CLASS
Java class file Java
CLD
Clipper debugger configuration file CA Clipper
CLJ
Clojure source code Clojure
CLP
Clip art graphics file Quattro Pro
CLP
Clipboard file Windows 3.x
CLP
Compiler response file CA Clipper
CLP
Graphics format PCPAINT/Pictor
CLPI
ClipAV Clip Information file for Blu-ray Media hardware / software with Blu-ray structure support
CLPRJ
ClassicLadder project file ClassicLadder
CLR
Color binary screen image 1st Reader
CLR
Color definitions Photostyler
CLR
Color scheme Boxer/2
CLR
Palette file for GIS format
CLS
C++ class definition file
CLW
MFC Class Wizard information Microsoft VC++
CM
Data file CraftMan
CMB
Xtree for Windows Button Bar file
CMD
Command dBASE - Waffle
CMD
Command Prompt batch file Microsoft Windows NT based operating systems
executable programs CP/M-86 operating system
CMD
External command menu 1st Reader
CMD
OS/2 batch/REXX file OS/2
CMF
FM-music file (Creative Music File)
CMK
Card Card Shop Plus
CMM
CMM script (batch) file CEnvi
CMP
Bitmap graphics (Lead CMP compression)
CMP
Compressed data PKWare Inc. data compression library
CMP
Header file for PostScript printer files CorelDRAW
CMP
Photofinish Calibration Map Photofinish
CMP
User dictionary Microsoft Word for DOS
CMRL
Concise message routing language DOTGO
CMS
Content Management System Any Web Browser
CMU
Carnegie Mellon University Formats
CMV
Animation (CorelMove CorelDraw 4.0) CorelMove CorelDraw 4.0
CNC
CNC general program data
CND
System generation conditional file RT-11
CNF
Configuration (program - printer setup) program - printer setup
CNF
Configuration file
CNV
Temporary file WordPerfect for Win
CNV
Winword DLL used as part of an import operation (CNV=converter) Microsoft Word
CO
Cobalt - parametric drafting and 3D modeling Ashlar-Vellum
COB
Calgari trueSpace2 File Format
COB
COBOL source code file
COD
Code definition table UUPC
COD
Datafile Forecast Plus - Microsoft Multiplan - StatPac Gold
COD
file uncluding CODES for any program/game many
COD
Printer code definition file Boxer/2
COD
Program compiled code FORTRAN
COD
Template source file dBASE Application Generator
COD
Videotext file
COE
Coefficient file Xilinx ISE
COF
Animation Control File Diablo II
COL
Color palette Autodesk Animator - many
COL
Spreadsheet Microsoft Multiplan
Command (memory image of executable program) DOS
COM
Indirect command file (sequence of commands to be executed) RT-11
CON
Configuration file Simdir
CON
MSTS Consist file MSTS
CPC
Compressed image Cartesian Perceptual Compression
CPD
Script Complaints Desk
CPF
Fax The Complete Fax
CPI
ColorLab Processed Image bitmapped graphics file
CPI
MS-DOS codepage file MODE.EXE
CPL
Control panel file Windows 3.x
CPL
Presentation Compel
CPMZ
ConPro/Miradi Zipfile Miradi and ConPro
CPP
C++ language source Watcom C/C++
CPP
Presentation CA-Cricket Presents
CPR
Knowledge Access GCGW
CPS
backup of startup files by QEMM (?) autoexec.cps
CPT
Encrypted memo file dBASE
CPT
Mac file archive COMPACT PRO
CPT
Template CA-Cricket Presents
CPZ
Music text file COMPOZ
CR2
Raw image format Canon digital cameras
CRA
Advanced crack file (usually text)
CRD
Cardfile Windows 3.x - YourWay
CRD
Map Holux - Alan
CRD
Molecular coordinates CHARMM, RasMol
CRDOWNLOAD
Google Chrome download in progress Google Chrome
CRF
Cross-reference Microsoft MASM - Zortech C++, RT-11 CREF
CRK
Crack file (usually text)
CRP
Encrypted database dBASE IV
CRS
File Conversion Resource WordPerfect 5.1
CRT
Terminal settings information Oracle
CRU
Compressed file archive created by CRUSH
CS
C# source file C#
CSD
Compact Shared Document Dream To Reality
CSG
Batch file (Submit) ISIS/w
CSG
Graph Statistica/w
CSM
Borland C++ 4.x precompiled header file BCW.EXE
CSP
PC Emcee Screen Image file Computer Support Corporation
CSS
Datafile CSS - Stats+
CSS
Datasheet Statistica/w
CSS
cascading style sheet
CSV
Adjusted EGA/VGA palette CompuShow
CSV
Comma Separated Values text file format (ASCII)
CTC
Control file PC Installer
CTF
Character code translation file Symphony
CTK
CommonTime Key file CommonTime software applications
CTL
Control file dBASE IV - Aldus Setup
CTL
BATCH control file (generated by BATCH from .BAT file) RT-11
CTT
BATCH Temporary file RT-11
CTX
Ciphertext file Pretty Good Privacy RSA System
CTX
Course TeXt file some Microsoft online guides
CTX
document Creativyst Table eXchange
CUF
C Utilities Form definition TCU Turbo C Utilities
CUR
Windows resource (cursor image file) Resource Workshop - WRT - Watcom Resource Editor
CUT
Graphics format (bitmapped graphics) dr. Halo
CV4
Color file CodeView
CVP
Cover page WinFax
CVS
Graphics Canvas
CVT
Backup file for CONVERTed database file dBASE IV
CVW
Color file CodeView
CWEB
C Web
CWK
Datafile ClarisWorks, Appleworks
CXX
C++ source code file Zortech C++

D

Ext. Description Used by
D
D Programming Language source file DMD
D3V
Video file Nintendo DS (with ARME, MMCF etc.)
D4D
Data Draw 4D object
D4P
Data Draw 4D Pro object
D64
Commodore 64 disk image
D88
Toshiba Pasopeia D88 disk image format A series of emulators of Japanese computers
DAA
Direct Access Archive
DAE
COLLADA file
DAF
Data file Digital Anchor
DAT
Maxum chromatograph chromatogram Siemens Maxum Chromatograph
DAT
LDraw (Sub)Part File, 3D Model LDraw
DAT
Document Microsoft Word Format (old)
DAT
data RSNetWorx Project
DAT
Data file in special format or ASCII
DAT
Database file Clarion (programming language)
DAT
Optical disc image (can be ISO9660, but not restricted to) cdrdao, burnatonce
DAT
Video CD MPEG stream
DATS
Dynamic source ATS
DB$
Temperature debug info Clarion Modula-2
DB$
Temporary file dBASE
DB
Database file Paradox - XTreeGold - dbvista
DB
Configuration dBASE IV - dBFast
DB
Multi Edit config ME
DB2
Database dBASE II
DB3
Database dBASE III
DBA
Database file Turbo Prolog - DataEase
DBA
DarkBasic source code
DBC
DataBaseContainer Visual FoxPro
DBD
Business data Business Insight
DBD
Debug info Clarion Modula-2
DBF
Database file dBASE III/IV - Visual FoxPro - dBFast - DataBoss - DBVista - CA-Clipper - Visual Objects - Alaska Xbase++ -

Advantage Database Server

DBG
Debugger script DOS debug - Watcom debugger
DBG
Symbolic debugging information Microsoft C/C++
DBK
Database backup dBASE IV
DBL
DIBOL source file
DBM
Datafile DataEase
DBM
Menu template DataBoss
DBO
Compiled program dBASE IV
DBPro
DarkBasicPro Project
DBS
Data file used by Managing Your Money
DBS
Database in SQL Windows format
DBS
Datafile PRODAS
DBS
Printer description file Microsoft Word, Microsoft Works
DBT
FoxBASE+ style memo FoxPro 2.x
DBT
Memo file for database w/same name dBASE IV - dBFast
DBW
Windows file DataBoss
DBX
DataBeam GCGW
DBX
AutoCAD Database AutoCAD
DBX
Archive File Outlook Express
DC
CAD drawing file DesignCAD 3000 for Windows
DC6
Image file Diablo II
DCA
Document Content Architecture text file IBM DisplayWrite
DCC
Animation Diablo II
DCD
CAD Drawing File DesignCAD 3DMax for Windows
DCF
floppy disk image Disk Copy Fast
DCH
Schematic Drawing file DipTrace Schematic Capture
DCI
Dreamcast Save File Dreamcast
DCL
Delphi Control Library Borland Delphi
DCM
DCM music module AWAVE
DCP
OS/2 device code page OS/2
DCS
Bitmap graphics (CYMK format) QuarkXPress
DCS
Datafile ACT! Activity Files
DCT
Dictionary: used by many programs with program dependent format Clarion
DCT
Spell checking dictionary Harvard Graphics 3.0 - Symphony
DCT
DataBaseContainer Extension Visual FoxPro
DCU
Delphi unit (compiled) Borland Delphi
DCW
Walter Machine Programing Walter Profile Editor
DCX
Multi-page PCX graphics (common fax format) Intel - SpectraFAX
DCX
DataBaseContainer Index Visual FoxPro
DD
Macintosh file archive DISKDOUBLER
DDA
Data GLBasic ASCII 3D object
DDB
Bitmap graphics
DDB
Digidesign Database File Digidesign ProTools
DDI
Disk image DiskDupe
DDP
Device Driver Profile file OS/2
DDS
DirectDraw Surface file Microsoft Flight Simulator, other Microsoft programs
DEB
DEBUG script DOS Debug
DEF
Assembly header file Geoworks
DEF
Defaults - definitions
DEF
Linker definition file TLink - WLink...
DEM
Demonstration
DEM
Digital Elevation Model
DEM
Graphics file VistaPro
DEM
Vista DEM file Meta.exe VP3
DES
Ascii text parameter description AWAVE
DESKLINK
Windows Explorer Desktop Control (commonly "Desktop (create shortcut).DESKLINK", 0 bytes). Uses a 'special' hidden file extension (NeverShowExt flag inside the Registry), overriding the Windows Explorer option of showing/hiding file extensions.
desktop
Desktop Entry freedesktop.org
DEV
Device driver
DEV
SYSGEN handler build procedure RT-11
DEV
Dev-C++ project file Dev-C++
DFD
Data Flow Diagram graphic file Prosa
DFF
RenderWare model data (e.g. Grand Theft Auto III and later)
DFI
Outline font description Digifont
DFL
Default program settings Signature
DFM
Data Flow Diagram model file Prosa
DFM
Delphi form module Borland Delphi
DFS
Delight Sound File
DFV
Printing form (Word) Microsoft Word
DFX
Micrografx Effects DLL
DGN
Graphics file MicroStation
DGS
Diagnostics
DH
Dependency information for .ph Geoworks
DHP
Dr. Halo PIC Format graphics file Dr. Halo II - III
DHT
Datafile Gauss
DI
D Programming Language interface file DMD
DIA
Diagraph graphics file Computer Support Corporation
DIB
Device Independent Bitmap rarely used Windows 3.0 bitmap; Win - OS/2
DIC
Dictionary (e.g. from WinWord)
DIF
Borland patch data file Borland patch
DIF
Data Interchange Format Visicalc
DIF
OS/2 V2.2 Display Information File OS/2
DIF
Output from Diff command - script for Patch command
DIF
SRCCOM, BINCOM output file RT-11
DIG
Digilink AWAVE
DIG
Sound Designer 1 audio file AWAVE
DIP
Graphics
DIP
Watcom debug info processor WatcomDebugger
DIP
PCB Drawing file DipTrace PCB Layout
DIR
Dialing directory file Procomm Plus
DIR
Directory file VAX - CPS Backup
DIR
Movie MacroMind Director 4.x
DIR
Directory listing file RT-11
DIS
Distribution file VAX Mail
DIS
Thesaurus CorelDraw
DIZ
Description file (Description In Zip)
DJVU
DJVU Document Format, a format similar to PDF but with higher compression rates at the same quality. DJVU
DKB
Raytraced graphics DKBTrace
DL
Animation format (Italian origin) Display - DL Viewer
DLD
Lotus 1-2-3
DLF
Dialogue Live Format Produced by Exstream Dialogue and edited by Dialogue Live Editor
DLG
Dialog resource script file Microsoft Windows SDK
DLG
Dialog resources DN
DLG
Windows SDK dialog editor data file
DLG
Windows SDK dialog editor data file
DLL
Dynamic-link library Windows 3.x - OS/2
DLL
Export/import filter CorelDRAW
DLM
Microsoft File Transfer Manager Microsoft File Transfer Manager
DLP
Data DAQLab
DLS
Setup Norton Disklock
DMF
Music format (Delusion Digital Music File) Delusion
DMF
DeleD files
DMG
Apple Disk Image Mac OS X (Disk Utility),
DMO
Demo Derive
DMP
Dump file (e.g. screen or memory)
DMP
DUMP utility output file RT-11
DMS
Amiga file archive DISKMASHER
DNG
Digital Negative (DNG), a publicly available archival format for the raw files generated by digital cameras. At least 30 camera models from at least 10 manufacturers, and at least 200 software products.
DNT
data RSNetWorx Project
DO
Java servlet file Web browser (Various)
DOC
A Document, or an ASCII text file with text formatting codes in with the text. This generic extension is used by many word processors. Microsoft Word and others
DOCM
Microsoft Word 2007 Master document Microsoft Word 2007
DOCX
Office Open XML Text document Microsoft Word
DOF
Delphi project options file Borland Delphi
DOG
Screen file Laughing Dog Screen Maker
DOH
Dependency information for .poh Geoworks
DOR
Roland Digital audio file Roland
DOS
External command file 1st Reader
DOS
Network driver (e.g. pkt_dis.dos)
DOS
OS/2 V3 SVGA PMI-File Svga.exe
DOS
System file for 'pure' MS-DOS usage (e.g. MSDOS.DOS, AUTOEXEC.DOS; alternate versions of MSDOS.SYS and AUTOEXEC.BAT respectively) Windows 95, 98
DOS
Text file containing DOS specific info
DOT
Line-type definition file CorelDRAW
DOT
Microsoft Word document template Microsoft Word
DOTX
Office Open XML Text document template Microsoft Word
DOX
Text file MultiMate 4.0
DOZ
Description Out of Zip VENDINFO
DP
Calendar file Daily Planner
DP
Data file DataPhile
DPR
Default project- and state-related information Borland C++ - Delphi - C
DPX
Digital Moving Picture Exchange
DRP
Web3D File Web3D
DRS
Display Resource WordPerfect for Win
DRV
Driver
DRW
Designer vector graphics file Designer - MicroGraphix
DS
TWAIN Data Source Any twain-source must supply one xxx.ds file
DS1
Map file Diablo II
DS4
Vector graphics Micrografx Designer 4.x
DSC
Celestia Deep Space Catalog file Celestia
DSC
Description file
DSC
Discard file Oracle
DSD
Database DataShaper
DSF
Data Storage Format Golden Helix
DSF
Delusion Digital Sound File Delusion
DSK
Desktop configuration BP - DN - BC++ - TP
DSK
Disk Drivers Novell NetWare
DSK
Logical disk file RT-11
DSM
Digital Sound Module DSI
DSN
Design Object System Designer
DSP
Display parameters Signature
DSP
Dynamic Studio Professional Module Dynamic Studio
DSP
Graphics display driver Dr. Halo
DSP
Norton viewer DLL Win
DSR
Driver Resource WordPerfect for Win
DSS
Screensaver file DCC
DSS
Digital Speech Standard (Sound) Digital Soup
DSS
SQL Script for .Time Framework Exaktime
DST
WAIN (Scanner spec) data source DLL Win
DSW
Borland C++ 4.x desktop layout file BCW.EXE
DSY
DAISY container file ADAKTA.EXE
DT1
Tile file Diablo II
DT2
msn-emoticon paint
DT_
Data fork of a Macintosh file Mac-ette
DTA
Data file Turbo Pascal - PC-File - Stata
DTB
Database Backup for .Time Framework Exaktime
DTF
Database file PFS - Q&A
DTL
Django template language djangoproject
DTM
DigiTrekker music module AWAVE
DTO
data Directory Toolkit output
DTP
Desk Top Publishing Document Timeworks / greenstreet Publisher3/ Greenstreet Publisher 4.5
DTP
Page Magic 2.0 publication Page Magic 2.0 upgrades to Greenstreet Publisher
DTP
Publication Publish-It! upgrades to Greenstreet Publisher
DTS
Torque Game Engine model format
DVC
Data Lotus 1-2-3
DVDPROJ
iDVD project file iDVD (Apple iLife '08)
DVI
DeVice Independent document TeX
DVP
DESQView run-file DESQView
DVP
Device parameter file AutoCAD
DW2
Drawing DesignCAD for DOS, & DesignCAD for Windows
DWB
Coryphaeus Software Designers Workbench CSD
DWC
Archive DWC
DWD
DiamondWare Digitized file AWAVE
Drawing AutoCAD, IntelliCAD, PowerCAD, Drafix, etc.
DX
Text file DEC WPS/DX format - DEC WPS Plus
DXF
Dialogue Exchange Format Exstream Dialogue
DXF
Drawing Interchange File Format vector graphics AutoCAD, IntelliCAD, PowerCAD, etc.
DXN
Fax Fujitsu dexNET
DXP
SpotFire data TIBCO Spotfire
DXP
ISO creation project file CD Burner XP Pro
DYLIB
Dynamic Library Mac OS-X
DYN
Data Lotus 1-2-3

E

Ext. Description Used by
E
E language source code E
E2D
2-dimensional vector graphics file Editor included in JFire
EAS
Extended file attributes OS/2
EAR
Enterprise archive archive
EBA
Source code Emergence BASIC
EBJ
Error-checking object file Geoworks
EBQ
CITE standard electronic BQ exchange file
EC
Error checking preprosessed Goc source code Geoworks
EC
Source code Ecere SDK
ECC
Error-checking file dvdisaster
ECE
Escenic Contentng Engine dynamic page Escenic
ECMS
Status document ECMerge
ECMT
Template document / Session ECMerge
ED5
EDMICS GCGW
EDA
Ensoniq ASR disk image AWAVE
EDE
Ensoniq EPS disk image AWAVE
EDF
European data format Medical timeseries storage files
EDF
Exchequer Document Format IRIS Software
EDF
Macrocom Online Kitchen-planer
EDK
Ensoniq KT disk image AWAVE
EDL
EDL Premiere
EDQ
Ensoniq sq1,2/ks32 disk image AWAVE
EDS
Ensoniq SQ80 disk image AWAVE
EDT
Default settings VAX Edt editor
EDT
Ensoniq TS disk image AWAVE
EDT
External editors definitions DN
EDV
Ensoniq VFX-SD disk image AWAVE
EEB
Button bar for Equation Editor WordPerfect for Win
EFA
Ensoniq ASR file AWAVE
EFA
Encrypted File Archive
EFE
Ensoniq EPS file AWAVE
EFE
Ensoniq EPS instrument file AWAVE
EFK
Ensoniq KT file AWAVE
EFQ
Ensoniq SQ1/SQ2/KS32 file AWAVE
EFS
Ensoniq SQ80 file AWAVE
EFT
Ensoniq TS file AWAVE
EFT
High resolution screen font ChiWriter
EFV
Ensoniq VFX-SD file AWAVE
EFX
Fax Everex EFax
EGA
EGA display font Ventura Publisher
EKA
Internal data files Borland's Eureka
EL
ELISP source code file Emacs lisp
ELB
Synergy/DE library
ELC
Compiled ELISP code Emacs lisp
ELFO
ELI
Archive ELI
ELT
Event list text file Prosa
EMAKER
E language source code (maker) E
EMD
ABT Extended MoDule AWAVE
Microsoft Enhanced Metafile
EML
Stationery Template Outlook Express
EMU
Terminal emulation data BITCOM
ENC
Encoded file - UUENCODEd file Lotus 1-2-3 - uuexe515.exe
ENC
Music Encore
END
Arrow-head definition file CorelDRAW
ENFF
Extended Neutral File Format
ENG
Dictionary engine Sprint
ENG
English documentation
ENG
Graphics file (charting) EnerGraphics
ENV
Envelope or Environments
ENV
Enveloper macro WOPR
ENV
Environment file WordPerfect for Win
EPD
Publication Express Publisher
EPI
Document Express Publisher
EPI
Encapsulated PostScript graphic file
EPS
Encapsulated PostScript (Graphics format) CorelDraw - PhotoStyler - PMView - Adobe Illustrator - Ventua Publisher
Electronic Publication - (e-Reader format) Okular (Linux) - Apple iBooks - Sony Reader - Adobe Digital Editions - Calibre (LMW)
EQN
Equation filE WordPerfect for Win
ERD
Entity Relationship Diagram graphic file Prosa
ERL
Erlang source code file
ERM
Entity Relationship Diagram model file Prosa
ERR
Compiler/linker error report
ESH
Extended Shell batch file
ETH
Document Ethnograph 3
ETF
Encrypted Text File. Used in some security programs.
ETW
Proprietary format from EnterTech for the MagicSing/Mic Karaoke product line. Enter-Tech
ETX
Structure-enhanced text for some ascii text browsers
EUI
Ensoniq EPS family CD image AWAVE
EVT
Events descriptions
EVY
Document WordPerfect Envoy
EWD
Document Express Publisher for Windows
EX3
Device driveR Harvard Graphics 3.0
EXC
Exclude file for Optimize (do not process) (QEMM) QEMM
EXC
REXX source code file VM/CMS
Directly executable program DOS
EXF
Excute file OnHand PC
EXM
MSDOS executable, system-manager compliant (HP calculator) HP calculator
EXP
Drawing File format Drawing Express
EXP
Protected mode EXE by PharLap Software PharLap
EXP
Exports Library File VisualStudio
EXT
Extensions descriptions file
EXX
Intermediate file by MsgPut IBM LinkWay
EZF
Fax Calculus EZ-Fax

F

Ext. Description Used by
F
Archive FREEZE
F
Fortran language source code file (in fixed form) Many Fortran compilers
F01
Fax perfectfax
F03
Fortran language source code file (in free form) Many Fortran compilers
F2R
Farandole Linear Module Farandole
F3R
Farandole Blocked Linear Module Farandole
F4
Fortran IV source code file
F4A
Flash Video F4V with only audio (see also SWF) Adobe Flash
F4B
Flash Video F4V audio book (see also SWF) Adobe Flash
F4P
Flash Video F4V with digital rights management (see also SWF) Adobe Flash
F4V
A container format for Flash Video that differs from the older FLV file format (see also SWF) Adobe Flash
F77
Fortran language source code file (in fixed form) Many Fortran compilers
F90
Fortran language source code file (in free form) Many Fortran compilers
F95
Fortran language source code file (in free form) Many Fortran compilers
F96
Fax Frecom FAX96
FAC
see FACE
FACE
Usenix FACE graphics file
FAL
Falcon script source Falcon
FAM
Famtasia Famicom image format Famtasia
FAQ
Frequently Asked Questions text file
FAR
Music format (Farandole Composer Module) Farandole
FAS
Macsyma compiled program
FAX
Fax (raster graphics in CCITT format) most Fax programs
FBM
Fuzzy Bitmap
FC
Spell checking dictionary Harvard Graphics 2.0
FCM
Binary file patch file (forward compression) jlpak10.zip
FD
Declaration file Microsoft Fortran
FD
Field offsets for compiler DataFlex
FD
Front Door' resource files FD
FDB
Font Definition Block Ming library
FDS
fwNES Famicom Disk System image fwNES
FDS
Headerless Famicom Disk System image
FDW
Form F3 Design and Mapping
FDX
Screenplay Final Draft
FE
Data Surface Evolver 3D surface
FEB
Button bar for Figure Editor WordPerfect for Win
FEI
Fatal Error Infotable Geoworks
FES
File produced when a fileless occurrence in 3D Topicscape is exported to Windows 3D Topicscape
FF
Intelligont FIAS format
FF
Outline font description Agfa Compugraphics
FFE
Front Fareast Famicom image format
FFF
Fax defFax
FFI
Atech FastFont (AllType)
FFIVW
File Format for the Interchange of Virtual Worlds
FFT
Dca/FFT Final Form Text text file (DisplayWrite)
FFT
DCA/FFT Final Form Text text file DisplayWrite
FH3
Vector graphics Aldus FreeHand 3.x
FH4
Vector graphics Aldus FreeHand 3.x
FI
Interface file Microsoft Fortran
FIF
Fractal Image Format file
FIG
Figure File MATLAB
FIL
Table Data Audit Command Language (ACL)
FIL
File template Application Generator
FIL
Filelist
FIL
Files list object file dBASE Application Generator
FIL
Mirror. FIL is the name given to the saved FAT by the mirror program included in some versions of DOS and in PCTools MS-DOS -
FIL
Overlay WordPerfect
FIL
File which was moved to the Virus Vault by AVG
FILM
Filmkey film file Filmkey Player
FIN
Print-formatted text file Perfect Writer - Scribble - MINCE
FIO
Aldus PhotoStyler graphics filter
FIO
Image PALS viewer DLL
FIT
File Index Table WindowsNT
FIT
see FITS
FIT
Fityk Script Fityk
FITS
Flexible Image Transport System astronomy software
FIX
Patch file
FKY
Macro file FoxPro
FLA
Source material for Flash applications (see SWF) Adobe Flash
Audio codec, Audio file format
FLAME
Fractal configuration file Apophysis
FLB
Format library Papyrus
FLC
Animation format FLIC >320x200 AAPlay - Autodesk AniPro
FLD
Folder Charisma
FLI
Animation format FLIC 320x200 Autodesk Animator
FLI
TeX font library EmTeX
FLM
Film Roll AutoCAD/AutoShade
FLP
Flstudio project file Fruity Loops (FlStudio)
FLT
Data/file conversion filter (or overlay) Alsud, Microsoft Word
FLT
Filter file Micrografx Picture Publisher
FLT
MultiGen Flight
FLT
Support file - graphics filter Asymetrix ToolBook
FLX
Animation format
FLX
Compiled binary DataFlex
FLV
A container format for Flash Video (see also SWF) Adobe Flash
FM
Database FileMaker Pro
FM1
Spreadsheet format overlay Lotus 1-2-3 release 2.x
FM3
Device driver Harvard Graphics 3.0
FM3
Spreadsheet Lotus 1-2-3 release 3.x
FMB
File Manager Button bar WordPerfect for Win
FMF
Font or icon file IBM LinkWay
FMK
Makefile Fortran PowerStation
FMO
Compiled format file dBASE IV
FMT
Format file dBASE IV - FoxPro - Clipper 5 - dBFast
FMT
Gate3 format file
FMT
Style sheet Sprint
FMV
Full Motion Video file
FN3
Font file Harvard Graphics 3.0
FND
Files searching properties Win95
FNI
FileNet Native Document FileNet
FNK
FunkTracker music module AWAVE, FunkTracker
FNM
Fannie Mae Residential Loan Data (RLD) format for mortgage submission to DO/DU. Desktop Originator
Fnn
DOS screen text font - height nn pixels fntcol13.zip
FNT
Font file many
FNX
Inactive font Exact
FO1
Font file Borland Turbo C
FO2
Font file Borland Turbo C
FOG
Fontographer Database File Fontographer3.5
FOL
Folder of saved messages 1st Reader
FON
Log of all calls Procomm Plus
FON
Terminate phonebook Terminate - Terminator - Telix
FON
Windows bitmapped font file Win
FONT
Font data unix
FOP
Freedom of the Press graphic file
FOR
Form WindowBase
FOR
Fortran language source file many
FOT
Installed Truetype font Windows Font Installer
FOX
Foxbase executable (precompiled .prg) FoxBase
FP
Final Page file FoxPro for DOS
FP
Tiff file TIFF/IT P1
FP
Video file DVICO/TVIX MPEG1 video file
FP3
Database FileMaker Pro
FP4
Database FileMaker Pro
FP5
Database FileMaker Pro
FP7
Database FileMaker Pro
FPC
Catalog FoxPro
FPD
TMT Pascal compiled unit TMT Pascal
FPM
Configuration file FoxPro for MacIntosh
FPT
Foxpro memo field tables FoxPro
FPU
Configuration file FoxPro for Unix
FPW
Floorplan drawing FloorPLAN plus for Windows
FPW
Configuration file Visual FoxPro
FPX
FlashPix Bitmap Image File FlashPix
FR?
Packed mail FTN software
FR3
Renamed dBASE III+ form file dBASE IV
FRF
FontMonger Database file FontMonger
FRG
Uncompiled report file dBASE IV
FRL
GP-Forth library GP-Forth
FRM
Registration or other form
FRM
Report file dBASE IV - Clipper 5 - dBFast
FRM
Visual Basic Form Visual Basic
FRO
Compiled report file dBASE IV
FRP
Form PerForm PRO Plus - FormFlow
FRS
Screen Font Resource WordPerfect for Win
FRT
Additional (FPT) report description file FoxPro
FRT
GP-Forth source file GP-Forth
FRX
Main (DBF) report description file Visual FoxPro
FRX
Visual Basic binary program file Visual Basic
FSA
Applied Biosystems Genetic Analysis data file GeneScan
FSIM
Simulation File Format Loudsoft
FSL
Form Paradox for Windows
FSM
Farandole Composer WaveSample Farandole
FSPROJ
Habanero Firestarter project Habanero Firestarter
FST
Linkable program dBFast
FST
Temporal database file GTKWave data file
FSTICK
Temporal database file Flash Joystick
FSX
Data Lotus 1-2-3
FTD
Falcon dynamic template Falcon
FTM
Fielded Text Meta - Contains schema/Meta for a Fielded Text file Fielded Text
FTM
Font file Micrografx
FTX
Declared Fielded Text Fielded Text
FTXT
text Cloanto text document
FTP
Configuration FTP Software PC/TCP
FUK
Map File Postal 2
FW
Database FrameWork
FW2
Database Framework II
FW3
Database Framework III
FWEB
Fortran WEB
FX
On-line guide FastLynx
FXD
Phonebook FAXit
FXP
Foxpro executable (precompiled .prg) Visual FoxPro
FXS
FAX Transmit Format graphics file WinFax
FYF
FileLoc FyTek, Inc.

G

Ext. Description Used by
G
Data chart APPLAUSE
G16
GoldED for DOS compiled config GOLDED.EXE
G3D
Glest model file G3D viewer
G3P
data Grand Prix 3 car physics
G8
Raw graphics file (one byte per pixel) plane three PicLab - Cubicomb Picturemaker
GAF
Globa Game Engine audio format Globa Game Engine
GAM
Fax GammaFax
GAMEPROJ
Gamesalad game project format GameSalad
GB
Game Boy ROM
GB1
Game Maker backup file (can also be GB2, GB3, etc.)
GBA
Game Boy Advance ROM
GBC
Game Boy Color ROM
GBL
Genesis Bitmap Layout
GBL
Global definitions VAXTPU editor
GBL
Global module in Basic programs
GBP
Genesis Bitmap Pattern
GBR
GIMP brush
GC1
Lisp source code Golden Common Lisp 1.1
GC3
Lisp source code Golden Common Lisp 1.3
GCA
IBM GOCA GCGW
GCD
Graphics
GCD
General content descriptor Wireless devices
GCD
Generic Cadd drawing Generic Cadd, Visual Cadd
GCF
Game cache file Steam content delivery system
GCH
GNU preprocessed C++ header file GNU C++ compiler
GCI
Nintendo GameCube save file Nintendo GameCube
GCX
Graph file Mac OS X Grapher
GD3
Game Doctor Super NES ROM image
GDF
General Data Format for Biomedical Signals Biomedical signal processing, Brain Computer Interfaces
GDF
Dictionary file GEOS
GDF
Geographical Data Format Various mapping software
GDF
IBM Graphics Data Format Legacy IBM systems
GDL
Data ArchiCAD model
GDS
McDonnell-Douglas Things
GE
GEcho config file GEcho
GED
GEDCOM Genealogy data exchange
GED
EDITOR's native file format Arts & Letters
GED
GoldED for DOS compiled config file GOLDED.EXE
GED
Graphics editor file EnerGraphics
GED
Game Editor Data / project file Game Editor
GEM
Vector graphics file GEM - Ventura Publisher
GEN
Compiled template dBASE Application Generator
GEN
Generated text Ventura Publisher
GEO
Geode Geoworks
GEO
GEOS specific file (application) GEOS
GEO
GoldED for OS/2 compiled config file GED2.EXE
GEX
GEcho config file GEcho
GFB
Compressed GIF image created by GIFBLAST gifblast.exe
GFO
SGI Radiosity
GFT
Font NeoPaint
GFT
GEM-translator font file
GFX
Instant Artist graphics Files Instant Artist
GFX
PCBoard @X-coded colorful text GFX2COM - GFX2EXE
GHO
Norton Ghost File (first file) Symantec
GHS
Norton Ghost File (split file) Symantec
GHW
GHDL Wave file GHDL/GTKWave data file
GIB
Chart Graph-in-the-Box
GIB
GIMP animated brush
GID
Help index windows 95 help
Compuserves' Graphics Interchange Format (bitmapped graphics) QPeg - Display - CompuShow
GIW
Presentation Graph-in-the-Box for Windows
GKH
Ensoniq Disk Image (VFX, SD, EPS, ASR, TS) Ensoniq
GKS
Graphics Kernel System
GL
Animation format grasprt.exe, PV
GL
Animation GRASP GRAphical System for Presentation
GLB
Global module in Basic programs
GLM
Datafile Glim
GLO
Global module in Basic programs
GLS
Datafile Across
GLY
Winword Glossary Microsoft Word
GM6
Game Maker Editable file as of version 6.x
GMD
Game Maker Editable file up to version 5.x
GMF
CGM graphics file APPLAUSE
GMK
Game Maker Editable file as of version 7.x or 8.x
GML
Game Maker GML file
GMOD
Data Golgotha 3D model
GMP
Geomorph tile map SPX
GMS
Ghost Mouse Script
GMS
Gesture and Motion File Formats
GMT
data RFactor car physics
GOC
Goc source code file Geoworks
GOE
GOES graphic file
GOH
Goc header file Geoworks
GP5
Guitar Pro 5 song Guitar Pro 5
GP
Geode parameter file Geoworks Glue
GP4
data Grand Prix 4 car physics
GPH
Graph Lotus 1-2-3/G
GPK
Omnigo program package
GPS eXchange Format
GR2
Screen driver Windows 3.x
GRA
Datafile SigmaPlot
GrADS
Metafile
GRAFFLE
OmniGraffle graph file
GRASP
Graphical System for Presentation
GRB
T-FLEX CAD file Top Systems
GRB
MS-DOS Shell Monitor file MS-DOS 5
GRD
Drivers for GRX (graphics library) GRX (c) Free Soft. Found.
GRDNT
Image format used in the core of some very obscure customized operating systems to represent gradients; see also SCTOR
GRE
data Grenoble Thermal ellipsoids Plot Program
GRF
Graph file Graph Plus - Charisma
GRIB
Gridded Binary
GRN
Drivers for GRX (graphics library) GRX (c) Free Soft. Found.
GRP
Group file Windows 3.x - Papyrus
GRP
Pictures group PixBase
GRY
Graphics format (RAW GREYz)
GS1
Presentation GraphShow
GS3
data GameStarter
GSA
data Microsoft Office Groove Space Archive
GSD
Vector graphics Professional Draw
GSM
Raw GSM 6.10 audio stream AWAVE
GSW
Worksheet GraphShow
GTA
data Microsoft Office Groove Tool Archive
GUP
PopMail
GV
GrandView outline file
GVO
Data GFXFX Vector Object
GWI
Groupwise File Local saved Email
GXL
Graphics library Genus
Archive GNU zip - WinZipNT
GZR
data GunZ action replay

H

Ext. Description Used by
H!
On-line help file Flambeaux Help! Display Engine
H!
Pertext database HELP.EXE
H--
C—language header Sphinx C--
H
Header file (usually C language) Watcom C/C++
H++
Header file C++
HA
Archive HA
HAL
Data file Hyper Access Lite OS/2
HAM
Disk Drivers NPA Novell NetWare
HAM
Hold And Modify Deluxe Paint image file
HAP
Archive HAP3
HBC
Compressed Archive File (Shrink Algorithm) Hyperbac
HBC
Compressed Archive File (Shrink Fast Algorithm) Hyperbac
HBE
Compressed, Encrypted Archive File (Shrink & AES256-bit Encryption) Hyperbac
HBK
MathCAD handbook MathCAD
HC
Header file
HCG
Document HCLab
HCGS
Document HCLab
HDD
data disk image
HDD
HotDisc Designer label
HDF
Amiga Hard Disk Image
HDF
Help file Help Development Kit
HDF
Hierarchical Data File graphics file SDSC Image Tools
HDL
Alternate download file listing Procomm Plus
HDMP
heap dumpfile
HDR
Datafile Egret
HDR
Message header text Procomm Plus - 1st Reader
HDR
PC-File+ Database header
HDR
SPOT image file
HDS
Hierarchical Data System
HDW
Vector graphics Harvard Draw
HDX
Help index AutoCAD - Zortech C++
HDZ
Amiga Zip compressed Hard Disk Image
HEP
Novell Help Librarian Data File Novell NetWare
HEX
Hex dump
HFI
HP Font Info file GEM
HGL
Highlight groups definitions DN
HGL
HP Graphics Language graphics file
HH
C++ header file
HHH
Precompiled header file Power C
HHP
Help information for remote users Procomm Plus
HI
Game high scores table
HIN
Molecule HyperChem
HIS
History of executing/viewing/editing DN
HIS
Yard Information File FYM
HKM
Stores sound in a bitmapped graphics file
HLB
Help library VAX
HLP
Help file WinHelp, Help Explorer Viewer
HLX
Multi Edit help file MultiEdit 5.0
HLZ
Multi Edit packed help file MultiEdit
HMI
Music format (MIDI)
HMM
Alternate Mail Read option menu Procomm Plus
HMP
Music format (MIDI)
HMP
Hump Setup File - Obsolete as of version 2.4 (See SET and SWT files) FYM
HNC
CNC program files Heidenhain (?) dialog
HOF
Hall Of Fame (game scores)
HP
Printout file for HP printers/plotters (HP/GL)
HP8
ASCII text HP Roman8 character set NewWave Write
HPF
HP LaserJet fonts PageMaker
HPG
see HPGL
HPGL
Plotter file vector graphics (Hewlett-Packard Graphics Language) AutoCad - Harvard Graphics
HPI
Font information file GEM
HPJ
Help project Microsoft Help Compiler for Windows - HC.EXE
HPK
Archive HPACK
HPM
Alternate Main menu for privileged users Procomm Plus
HPM
EMM text HP NewWave
HPM
High Performance Map Quaestor 1.x
HPP
C++ header file Zortech C++ - Watcom C/C++
HPPCL
Hewlett-Packard Printer Control Language
HQX
Archive (ASCII Mac) BINHEX
HRF
Graphics file (Hitachi Raster Format)
HRM
Alternate Main menu for limited/normal users Procomm Plus
HRZ
Graphics format SSTV
HS2
Monochrome image Postering
HSC
2-op FM music HSC tracker - hscplay.exe
HSH
Disk image hash file DriveSnapshot
HSI
Handmade Software Inc. graphics file almost JPEG Image Alchemy
HST
History file Procomm Plus
HTM
see HTML
Hypertext Markup Language (WWW) Netscape - Mosaic - many
HTX
Hypertext file
HWA
Hollywood applet Hollywood
HWD
Presentation Hollywood Designer
HWP
Hangul Word Processor Document Hangul (word processor)
HWS
Hollywood script Hollywood
HXM
Alternate Protocol Selection menu for all users Procomm Plus
HXS
Microsoft Help 2 compiled help file Microsoft Windows, Help Explorer Viewer
HXX
C++ header file
HY1
Hyphenation algorithms Ventura Publisher
HY2
Hyphenation algorithms Ventura Publisher
HYC
Data WordPerfect
HYD
Hyphenation dictionary WordPerfect for Win
HYP
Archive HYPER

I

Ext. Description Used by
I
Preprocessor output file Borland C Preprocessor
IAK
Internet Access Kit OS/2
IAM
Assembly file Autodesk Inventor
IAX
Bitmap graphics (IBM Image Access eXecutive)
IAX
data InstallAnywhere.NET project
IBG
PDS graphic file
IBM
Archive (Internal IBM only) ARCHDOS
ICA
Bitmap graphics (Image Object Content Architecture)
ICB
Bitmap graphics
ICC
ICC configuration
ICE
Archive Cracked LHA (old LHA)
ICM
ICC configuration
ICN
ICON source code file
ICO
Icon file ICONEDIT.EXE; Microsoft Windows
ID
Disk identification file
IDB
IDA database IDA
IDB
VC++ Minimum Rebuild Dependency File Visual C++
IDC
IDA C language source IDA
IDE
Borland C++ 4.x IDE project BCW.EXE
IDF
MIDI instrument description
IDS
IDA imported names format IDA
IDW
Vector graphics IntelliDraw
IDW
Drawing file Autodesk Inventor
IDX
Index many - FoxPro; also unrelated Quicken file format.
IFD
Form JetForm Design
IFF
Interchange Format File (IFF) EA Software - Convert (C) Villena - Amiga
IFF
Sun TAAC Image File Format SDSC Image Tool
IFP
Script KnowledgeMan
IFS
Fractal image compressed file Yuvpak
IFS
Iterated fractal system file IFS Creation Kit, Apophysis
IFS
Installable file system OS/2
IGES
Initial Graphics Exchange Specification
IGF
Inset Systems GCGW
IGC
Flight tracks downloaded from GPS devices in the International Gliding Commission's prescribed format
IHP
Watcom help file whelp.exe
IHS
Inbound History Bink/+
IIW
Power Point Image Importer Wizard
IL
hDC Designer Icon Lin dll format
ILB
Data Scream Tracker
ILG
data LaTeX Index Generation log
ILK
Outline of program's format Microsoft ILink incremental linker
IM
Auran Jet indexed mesh file Trainz
IM8
Sun raster graphics file
IMA
Mirage vector graphics EGO - Chart - Autumn
IMG
ADEX graphic file
IMG
Disk Image NC 5.0
IMG
GEM bitmapped graphics file Ventura
IMG
Image for Windows/Image for DOS Disk image TeraByte, Inc. dba TeraByte Unlimited
IMG
Vivid IMG file
IMI
image Magellan Meridian map
IMI
image Magellan eXplorist map
IMP
Spreadsheet Lotus Improv
IMQ
Image presentation ImageQ
IN$
Installation file HP NewWave
IN3
Input device driver Harvard Graphics 3.0
INB
Test script Vermont HighTest
INC
Include file several programming languages
IND
Data Index dBASE IV
INDD
InDesign Document Adobe InDesign
INF
Information text file (ASCII)
INF
Install script
INF
OS/2 hypertext help system file VIEW.EXE
INF
Type 1 LaserJet font information file soft font installers
INFO
GNU info reader (output from Texinfo) info (Unix)
INFO
Icon Data (Amiga)
INGR
Intergraph Raster File Format
Initialization file
INK
Pantone reference fills file CorelDRAW
INS
Data WordPerfect
INS
Ensoniq Instrument File Ensoniq
INS
Installation script 1st Reader
INS
Instrument music file (Adlib)
INT
Borland Interface Units
INT
Program saved in Internal (semi-compiled) format Signature
INT
Source of Borland interface module
INX
Index Foxbase
IO
Archive CPIO
IOB
3d graphics database in TDDD format
IOC
Organizational chart Instant ORGcharting!
ION
4DOS descript.ion file (file descriptions) 4DOS
IP
Immortal Player file Immortal Player
IPC
Intellitec Program Configuration - used to configure vehicle electronics Intellitec
IPF
Interchangeable Preservation Format SoftPres
IPG
iPod game file iTunes and iPod
IPH
Hi-Res Image InterPaint
IPL
Pantone Spot reference palette file CorelDRAW
IPN
Intecplan project Intecplan Business Plan Software
IPS
IPS Patching Format (International Patching System) Rom hacking community
IPT
Part file Autodesk Inventor
IPT
MultiColor Image InterPaint
IRRMESH
static irrMesh files
IRS
Resource (WordPerfect) standard.irs WordPerfect
IRT
Data IRIT 3D model
IRTR
Graphicon-2000 Interactive Real-Time PHIGS
ISD
Spelling Checker dictionary RapidFile
ISH
Archive ISH
ISMA
Output Video file Islam Abusa'a Software
ISO
ISO-9660 table see: List of ISO image software
IST
Digitrakker Instrument File AWAVE
IT
Impulse Tracker music file Impulse Tracker
IT
Settings intalk
ITF
Interface file JPI TopSpeed Pascal
ITL
iTunes music library
ITN
Itinerary file TomTom PNDs
ITT
IconTweaker Theme
IV
SGI Inventor
IV-VRML
Inventor VRML Format
IVE
OpenSceneGraph 3D model
IVI
Image file ImmerVision
IVL
Lensflare file ImmerVision
IVP
Panorama file ImmerVision
IVU
User Interface file ImmerVision
IW
Presentation flowchart IconAuthor - HSC InterActive
IWA
Text file IBM Writing Assistant
IWB
Information WorkBench Prodeo
IWD
Call of Duty Map - Game Data Archive Activision, Inc.
IWP
Text file Wang
IX
data dtSearch index
IZT
Izl binary token file IZL

J

Ext. Description Used by
J2C
JPEG 2000 image
JAM
Jam messagebase FTN software
Jam music score Jam
JAR
Archive JAR. Java Games and Applications
JAS
see JASC
JASC
Graphics format (JASC)
JAV
see JAVA
JAVA
Java source code file
JBD
Datafile SigmaScan
JBIG
Joint Bilevel Image Group
JBX
Project file Project Scheduler 4
JCN
JobClock.Net Synch File
JET
Fax Hybrid JetFax
JFF
see JFIF
JFIF
JPEG File Interchange Format
JIF
see JFIF
JMS
Music format (JMusic file) UltraForce
JOB
Gravostyle engraving pattern file Gravostyle/Gravograph
JOB
QUEUE output file RT-11
JOR
Journal file SQL
JOU
Journal backup VAX Edt editor
JP2
JPEG 2000 image
JPC
Graphics Japan PIC
Joint Photography Experts Group graphics file format QPeg - FullView - Display
JPG
see JPEG
JRE
Java Runtime Environment Java
JRN
JMP journal JMP
JSP
Java Server Pages
JS
JScript script file Javascript
JTF
Fax Hayes JT Fax
JTF
Graphics (TIFF file with JPEG compression)
JK
Root File of a lol Earl Grey
JVX
Data JavaView object
JW
Text document JustWrite
JWL
Library JustWrite
JZZ
Spreadsheet Jazz

K

Ext. Description Used by
K2A
Data Prince of Persia 3D object
K3D
Description of macro language 3DS 3DS
KAP
Map Info Sea Chart
KAR
Music format (Karaoke) ITune 1000.Corp
KAR
Precompiled .prg for KARAT Rus. FOX+ 2.0
KB
Keyboard script Borland C++ 4.5
KB
Program source Knowledge Pro
KBASIC
Source KBasic
KBD
Keyboard mapping LocoScript - Signature - Procomm Plus
KBM
Keyboard mapping Reflection 4.0
KCL
Lisp source code Kyoto Common Lisp
KDB
KeePass 1.x database file KeePass
KDBX
KeePass 2.x database file KeePass
KDC
Kodak Digital Camera (graphics) PhotoEnhancer by PictureWorks
KEP
(unknown) (unknown)
KEX
Kedit Macro File Kedit
KEY
Datafile Forecast Pro
KEY
Keynote presentation file Keynote (Apple iWork '08)
KEY
Keyboard macros
KEY
OS/2 archive .key-file (i.e. OS2.KEY) OS/2
KEY
Security file e.g. Shareware Registration info
KFN
complex music format|[2] Karafun Karaoke(R)
KFX
Kofax Group GCGW
KIT
Power Chords drum kit file Power Chord
KMC
KatzReview's MegaCrammer
KML
Kedit Macro Library
Keyhole Markup Language
Kedit
Google Earth
KMY
data KMyMoney
KMZ
Keyhole Markup Language (Zip compressed) Google Earth
Knn
Database key file Clarion
KNO
Personal Knowbase data file Personal Knowbase
KPL
source code Phrogram
KPP
Toolpad SmartPad
KPS
IBM KIPS bitmap graphics
KR1
Kurzweil 2000 sample file AWAVE
KR2
Kurzweil 2000 sample file AWAVE
KRZ
Kurzweil K2000 File Kurzweil
KS
Source code KonsolScript Document
KS3
Data 3D Forgastest Editor object
KTU
Know The Unknown Online Service Packs Unknownsoft
KWB
Knowledge WorkBench Prodeo
KYB
Keyboard mapping FTP Software PC/TCP

L

Ext. Description Used by
L
LEX source code file
L
Linker directive file WATCOM wlink
L
LISP source code file
LA0
Datafile SCUMM index file
LAB
Datafile NCSS - SOLO
LAB
Mailing labels Q+E for Microsoft Excel
LAN
Erdas image file
LAN
LAN Drivers Novell NetWare
LAY
Word chart layout APPLAUSE
LBG
Label generator data dBASE IV
LBL
Label dBASE IV - Clipper 5 - dBFast
LBM
Graphics format (Amiga) Pic-view - Deluxe Paint
LBM
Linear bitmap graphics XLib
LBO
Compiled label dBASE IV
LBR
.LBR Archive for CP/M and MS-DOS using the LU program
LBR
Display driver Lotus 1-2-3
LBT
Additional (FPT) label description file FoxPro
LBX
Main (DBF) label description file FoxPro
LCF
Linker Control File Norton Guides compiler
LCH
Chart IBM Works for OS/2
LCK
Lockfile Paradox
LCL
Data (FTP Software PC/TCP)
LCL
Data FTP Software PC/TCP
LCN
Lection WordPerfect
LCS
Datafile ACT! History Files
LCW
Spreadsheet Lucid 3-D
LD
Long Distance codes file Telix
LDA
Absolute binary file (load image) PDP-11, RT-11
LD1
Overlay file dBASE
LDB
Data filer database IBM Works for OS/2
LDB
Overlay file Microsoft Access
LDF
Data filer form IBM Works for OS/2
LDF
Library definition file Geoworks Glue
LE
DOS/4GW executable image DOS/4GW PM 32X DOS Extender
LES
Lesson (check *.cbt)
LEV
Level file NetHack 3.x
LEX
Dictionary Microsoft Word - Lexicon
LFL
LucasArts resource file
LFD
LucasArts resource file LucasArts games
LFT
Laser printer font ChiWriter
LG
Logo procedure definitions LSRHS Logo
LGO
Logo for header and footer SuperFax
LGO
Startup logo code Windows 3.x
LHA
Archive LHA/LHARC
LHW
Amiga archive LHWARP
LIB
Library file several programming languages
LIC
License file used by some programs to put their license on disk
LIF
Archive
LIF
CA Clipper packed file CA Clipper installer
LIF
Logical Interchange Format data file Hewlett-Packard
LIM
Archive LIMIT
LIN
Line types AutoCAD
LIS
Listing VAX
LIT
Microsoft E-book file Microsoft Reader
LIT
Web3D File Web3D
LIX
Log file (history) Audit Command Language (ACL)
LJ
Text file for HP LJ II printer
LL3
LapLink III related file (document) LapLink III
LM
Auran Jet LOD mesh table (text file to control LODs) Trainz
LMP
Doom lump (data file, commonly "demo" recordings) Doom - Doom2
LNG
Language definition file
LNK
Linker response file .RTLink
LNK
Linker script
LNK
Windows 95 shortcut Windows 95
LNK
Windows XP shortcut Windows XP
LOD
Load file
LOG
Log file Numerous systems
LOM
3D Model Lock On: Modern Air Combat
LPC
Printer driver TEKO
Lyrics data
LRF
Linker response file Microsoft C/C++
LRF
Unencrypted BroadBand eBook file Sony Librie eBook reader
LRP
Report IBM Works for OS/2
LRS
Language Resource File WordPerfect for Win
LRX
Encrypted BroadBand eBook file Sony Librie eBook reader
LSA
Lightscape Technologies ASCII
LSB
Lightscape Technologies Binary
LSP
LISP source code file Xlisp, AutoLISP
LSS
Spreadsheet Legato - IBM Works for OS/2
LST
Aus. BOM Hourly weather Data
LST
Filelist FRQView
LST
Keyboard macro 1st Reader
LST
List file (archive index - compiler listfile)
LST
Listing (e.g. source code)
LST
Map list Holux - Alan
LST
Spool file Oracle
LST
SLP output file RT-11
LTA
Data LithTech ASCII 3D object
LTM
Form (Lotus Forms) Lotus
LUA
Lua script file Microsoft Visual C++, Notepad++
LUW
label data file Labels Unlimited for Windows
LUX
2D and 3D graphics data file Foliomap and Spectramap
LUZ
3D graphics data file Spectramap CUDA
LWD
Text document LotusWorks
LWO
Lightwave Object Format
LWP
Word processor IBM Works for OS/2, Lotus Wordpro
LXF
Lego Exchange Format Lego Digital Designer data file
LXO
Luxology scene modo3D software
LXT
Temporal database file GTKWave data file
LY
LilyPond Notation File LilyPond
LYR
Lyrics (ASCII)
LZ
Archive Lzip
LZD
Difference file for binaries LDiff 1.20
LZH
Archive LHA/LHARC
LZS
Archive LARC
LZW
Archive LHWARP
LZX
Amiga Archive LZX

M

Ext. Description Used by
M
Mathematica Package File Mathematica
M
MATLAB M-File MATLAB
M2
WoW Model Object file Blizzard Entertainment games (World of Warcraft/Warcraft series)
M2TS
MPEG 2 Transport Stream Various media playback devices / software
M3U
M3U playlist file Winamp, XMMS
M3U8
Unicode version of M3U playlist file (UTF-8) Winamp, XMMS
M4A
Advanced Audio Coding
M4r
iPhone ringtone iTunes and iOS devices
M7P
Multilizer 2007 and 2009 localization project file Multilizer
M8M
8MAM8 Model File
MAFF
Mozilla Archive Format Mozilla Firefox (with add-on)
MAI
Mail VAX
MAK
Makefile
MAK
Project file VB - VC ++
MAN
User guide (manual)
MANAGER
Accounting data file Manager - free accounting software
MAP
Color palette file
MAP
Format data Micrografx Picture Publisher
MAP
Linker map file
MAP
Map file (usually created by compilers)
MAP
Map Atlas MapMaker
MAP
Network map AccView
MAP
Game map for Duke Nukem 3D
MAR
Assembly program VAX Macro
MAR
Microsoft ARchive MSN Explorer (possibly other Microsoft products too)
MAR
Mozilla ARchive Mozilla Updater (used to house binary updates to products)
MAS
SmartMaster set Freelance Graphics
MAT
Data MATLAB
MAT
Microsoft Access Table Microsoft Access
MAX
MAX source code file
MB
Memo field values for database Paradox
MBK
Multiple index file backup dBASE IV
MBX
Mailbox data Eudora/ZERBERUS
MCC
Configuration file Mathcad
MCD
MathCad file MathCad
MCF
Font file Mathcad
MCF
Photo book or photo calendar layout file FotoInsight Designer
MCF
Multimedia Container Format (predecessor of Matroska)
MCI
MCI command script Media Control Interface
MCL
Multi Edit macro library Multi Edit
MCL
Cartesian manipulator for laser systems
MCP
Application script Capsule
MCP
Printer driver Mathcad
MCW
Text file MacWrite II
MDL
Quake 1 Model File id Software
Quake 2 Model File id Software
Quake 3 Model File id Software
MD5
Doom 3 and Quake 4 Model File id Software
MD
Archive mdcd10.arc
MDA
Data Microsoft Access
MDA
Microsoft Access system database Microsoft Access
MDB
Microsoft DataBase Microsoft Access
Several uses
MDL
Model 3D Design Plus or Simulink
MDL
Spreadsheet CA-Compete!
MDM
Modem definition file TELIX
MDMP
Mini dumpfile
MDR
Microdrive file ZX Spectrum emulator by g.a.lunter
MDS
Midi Session Sound Imp.
MDT
Data table Microsoft ILink incremental linker
MDX
Multiple index file dBASE IV
MDZ
Text description of music module Cubic Player - Cross-View
ME
MultiEdit configuration MultiEdit
ME
Text file READ.ME
MEB
Macro Editor bottom overflow file WordPerfect Library
MEC
MECCA source Maximus
MED
Macro Editor delete save WordPerfect Library
MED
Music format MED/OctaMED
MEM
Macro Editor macro WordPerfect Library
MEM
Memory variable save file dBASE IV - FoxPro - Clipper
MEM
Memos datafile Clarion
MEM
Mnemosyne database Mnemosyne; other spaced repetition software
MEQ
Macro Editor print queue file WordPerfect Library
MER
Macro Editor resident area (vakioalue) WordPerfect Library
MES
Macro Editor work space file WordPerfect Library
MES
Message
MET
Document Omnipage Pro
MET
Macro Editor top overflow file WordPerfect Library
MET
OS/2 graphics metafile PICVIEW.EXE
MEU
Menu group DOS Shell
MEX
Macro Editor expound file WordPerfect Library
MEX
MEX file (executable command) Matlab
MF
Metafont file TeX
MFA
Source code file Multimedia Fusion 2 / The Games Factory 2
MFF
MIDI Cakewalk, MTPro 4
MFM
Music format DMP
MGF
Font Micrografx
MGF
Materials and Geometry Format
MGX
Designer 4.1 Drawing Designer 4.1
Web Archive Single File
MIB
Snmp MIB file
Standard MIDI file music synthetizers, Winamp
MIDI
See MID
MIFF
Magick Image File Format
MII
Datafile MicroStat-II
MIME
Message in MIME format (RFC822)
miniUSF
Nintendo proprietary MIDI file format for the Reality Signal Processor (Nintendo 64) Nintendo 64 games
MIO
MyInfo topic Milenix MyInfo
MIS
Mission, used by many games
MIX
Object file Power C
MK
Makefile
MKE
Makefile Microsoft Windows SDK
MKG
Makefile
MKI
Graphics format (Japan MKI)
MKI
Japanese graphics MAKIchan format MagView 0.5
MKS
Data TACT
Matroska Multimedia Container Media Player Classic, Windows Media Player, Matroska Splitter
ML3
Project Milestones 3.x
MLB
Macro library file RT-11, Symphony
MLI
3DS Materials Libraries 3D Studio
MLRAW
Data Moonlight Creator RAW format 3D object
MLV
LabVIEW MathScript
MM
Text file MultiMate Advantage II, FreeMind mind map file (XML)
MMF
Mail message file Microsoft Mail
MMM
Multimedia movie file, RIFF RMMP format MacroMind Director 3.x
MMO
Memo writer file RapidFile
MMP
Output video format from Bravado board
MN
MuPAD Pro Notebook Workspace file of MuPAD (integrated in Matlab)
MND
Menu source AutoCAD Menu Compiler
MNG
Map DeLorme Map'n'Go
MNT
Additional (FPT) menu description file FoxPro
MNT
Menu memo FoxPro
MNU
Advanced macro file HP NewWave
MNU
Menu AutoCAD Menu Compiler - Norton Commander - Signature
MNU
Microsoft Mouse menu (for DOS apps)
MNX
Compiled menu file AutoCAD
MNX
Main (DBF) menu description file FoxPro
MNY
Account book Microsoft Money
MO?
Packed mail FTN software
MOB
Device definition file PEN Windows
MOBI
eBook Mobipocket
MOD
Modula language source
MOD
MODULA-2 source code file Clarion Modula-2
MOD
Module—used by Windows for DLL which implement DOS support Win
MOD
Music format (Amiga module) DMP - ST - MDP - VP
MOL
MOD4WIN PlayList Mod4Win
MOL
MDL Molfile RasMol
MOL2
Tripos’ Sybyl MOL2 Format SYBYL, RasMol
MON
SYSGEN monitor build procedure RT-11
MON
Monitor description ReadMail
MOP
MOPAC input file MOPAC, RasMol
MOV
Animation format (Mac) QuickTime
MOV
Movie file AutoCAD AutoFlix
MP2
Mpeg audio file Winamp, xing
MPEG audio stream, layer 3 AWAVE, CoolEdit(+PlugIn), Winamp, many others
multimedia container format, MPEG 4 Part 14 Winamp
MPA
MPEG audio stream, layer 1,2,3 AWAVE
MPC
Calendar file Microsoft Project
MPC
Musepack audio
multimedia containter format, video, audio MPEG Player, Winamp
MPG
see MPEG
MPKG
Multipackage installer script Mac OS X
MPL
MediaRack Midi Playlist MediaRack
MPM
MathPlan macro WordPerfect Library
MPP
Project file Microsoft Project
MPPZ
MagicPlot project file MagicPlot
Mo'PaQ Archive Blizzard games
MPR
Generated executable menu file FoxPro
MPR
Multilizer 5.x and 6.x localization project file Multilizer
MPR
Command & Conquer: Red Alert 2 map file Red Alert 2
MPT
Bitmap graphics (Multipage TIFF)
MPV
View file Microsoft Project
MPX
Compiled executable menu file FoxPro
MPX
Video format
MPZ
Miradi Project Zipfile Miradi
MRB
Multiple Resolution Bitmap graphics file Microsoft C/C++
MRC
mIRC file mIRC
MRK
Windows User Benchmark Win95
MRS
Macro Resource file WordPerfect for Win
MS
Microsoft antivirus report MSAV
MSC
Microsoft C makefile
MSC
management saved console[3] Microsoft; Microsoft MMC[4]
MSI
Windows Installer Package Windows Operating Systems
MSD
Secure and Encrypted File mysecuredelivery/Download
MSDL
Manchester Scene Description Language
MSG
Message base (e.g. HMB)
MSG
Message text file (ASCII) Microsoft Outlook
MSG
ZVoice digitized voice file
MSE
Set file Magic Set Editor
MSO
Microsoft Word OLE Web Page Storage Stream Microsoft Office
MSO
Microsoft Outlook metadata for a Microsoft Word 2000 email attachment.[5] Microsoft Outlook
MSP
Bitmap graphics file Microsoft Paint
MSP
Graphics format Microsoft Paint
MSPRODUCER
Media Project Microsoft Producer (for Microsoft PowerPoint XP/2003) Project
MSQM
data Microsoft Message Queuing
MSN
Project National Instruments for NI MultiSim-Electronic Circuit simulator
MSS
Manuscript text file Perfect Writer - Scribble - MINCE - Jove
MST
Document MS Test
MST
Minispecification file Prosa
MST
Setup script file Microsoft Windows SDK
MSW
Text file Microsoft Word
MSX
CP/M archive MSX
MTH
Math file Derive
MTL
Wavefront
MTM
Music format MultiTracker
MTS
Master Track Pro Files MTPro 4
MTS
data F1 2001, F1 2002 and F1 Challenge 1999 - 2002 car physics (All from the EA Sports F1 Series)
MTV
MTV Ray Tracer graphic file
MTW
Datafile Minitab
MU
Quattro pro for DOS Menu definition file Quattro Pro
MUS
Finale music document. Finale
MUS
Music format (MIDI in Doom)
MUS
Sound file MusicTime
MUZ
Hover Game MIDI File Windows' Hover! Game[6]
MVF
Stop frame file AutoCAD AutoFlix
MVI
Movie command file AutoCAD AutoFlix
MVO
Data Mad Virgin 3D object
MVW
Log file Saber LAN
MWF
Animation ProMotion
MWS
MWave DSP synths instrument AWAVE
Material exchange format (RFC 4539, SMPTE 377M)
MXL
PackRat 5.0 support DLLs PackRat 5.0
MXM
Material Maxwell Render
MXP
Adobe Extension File Adobe Dreamweaver and Adobe Flash
MXP
3ds Max Configuration File 3ds Max
MXP
MasterCook exported recipe
MXT
Data Microsoft C
MYP
Presentation MM Make Your Point
MZ
Binary-format Map MazeEdit
MZE
Text-format Map MazeEdit
MZG
Binary-format Map Collection MazeEdit
MZX
Binary-format Encrypted Map MazeEdit

N

Ext. Description Used by
NAM
Name Space Modules Novell NetWare
NAP
Naplps file (VideoShow) EnerGraphics
NAPLPS
North American Presentation Layer Protocol Syntax
NB
Text file Nota Bene
NB
Wolfram Mathematica Notebook Mathematica
NBF
Nokia Backup File Nokia Mobile Phones
NC
Binary Data netCDF software package
NC
Instructions for NC (Numerical Control) machine CAMS
NC
Non-error checking preprosessed Goc source code Geoworks
NCC
CNC (Computer Numeric Control) control file CamView 3D
NCD
Norton Change Directory support file Norton Commander
NCP
Re-volt Collision file Re-volt
NDB
Network database Intellicom - Compex
NDS
Nintendo DS ROM file used for Homebrew and commercial (Game) files on DS Nintendo DS
NDL
Nodelist file
NDX
Index file dBASE II - III - IV - dBFast
NEO
Raster graphics file Atari Neochrome
NES
iNES ROM image format
NET
Network configuration/info file
NEU
Pro/Engineer neutral file format PTC Pro/Engineer
netCDF
Network Common Data Format
NEW
New info
NFF
Haines Neutral File Format
NFF
WorldToolKit Neutral File Format
NFO
Folioview database
NFO
Help format Nextpage Folio
NFO
Info file Compact NFO Viewer
NG
Hypertext Database Norton Guide
NGO
NG linker object file NGML
NGS
;
NG compiler source file NGC
NIF
netimmerse/gamebyro file
NIL
NIL Icon Hear-It
NITF
National Imagery Transmission Format
NK2
e-mail address autocomplete archive Microsoft Office Outlook
NL
Norton Desktop Icon Library
NLM
Netware loadable module Novell Netware
NLS
National Language Support file MS-DOS
NLX
Form FormWorx 3.0
nmf
Node Map File Used by SpicyNodes
nnn
Arj archive volumes up to 999 ARJ
nnn
Netware unicode rule table (e.g. 1250_Uni.036) Novell Netware
nnn
News about smth with ext. of ver. number
nnn
RAR archive volumes up to 999 RAR
NOT
Notation
NOT
Yard Notes File FYM
NP
Project schedule (Nokia Planner) Nokia Planner
NPI
Source for DGEN.EXE interpreter dBASE Application Generator
NPJ
Nile Project Game Mission Editor
Nero Disc Image File Nero Express / Burning ROM
NRW
Nikon Coolpix RAW image Nikon
NSA
media Nullsoft Streaming Audio
NSF
database Lotus Notes
NSF
Music module NES Sound File
NSS
Norton screensaver module NC - NDW Screen Saver
NST
Music module Amiga Noise Tracker
NSV
media Nullsoft Streaming Video
NSX
Compound index file SuccessWare SIX 3.00
NT
Startup files Windows NT
NT3
BAHN Layout file JBSS BAHN
NTF
database design template Lotus Notes
NTH
Nokia Theme File Nokia PC Suite
NTR
Executable ASCII text file (strip header and rename) netrun31.zip
NTS
Executable ASCII text file (strip header and rename) netsend1.zip
NTS
Tutorial Norton
NTX
Database index file Clipper 5
NUF
Message for new users on their 1st call Procomm Plus
NUMBERS
Numbers spreadsheet file Numbers (Apple iWork '08)
NV
NewViews DOS accounting database QW Page NewViews
NV2
NewViews accounting database QW Page NewViews
NWS
Info text file (latest news) (ASCII)
NXT
Sound (NeXT format)

O

Ext. Description Used by
O$$
Outfile Sprint
O
Object file UNIX - Atari - GCC
O01
Typhoon vOice file AWAVE
OAZ
Fax NetFax Manager
OB
Object cut/paste file IBM LinkWay
OBD
Microsoft Office Binder MSOffice
OBJ
Compiled machine language code
OBJ
Object code Intel Relocatable Object Module
OBJ
Wavefront Object
OBJF
Data Triangle strips object
OBR
Object browser data file Borland C++
OBS
Script ObjectScript
OBT
Microsoft Office Binder Template MSOffice
OBV
Visual interface ObjectScript
OBZ
Microsoft Office Binder Wizard MSOffice
OCF
Object Craft File Object Craft
OCD
OCAD Map File OCAD
OCR
Incoming fax transcribed to text FAXGrapper
OCT
Musical file Pctalizer
OCX
New Custom Control's format in VB 4.0 Visual Basic
OCX
OLE custom control
ODB
OpenDocument database OpenOffice.org Base
ODF
OpenDocument formula OpenOffice.org Math
ODG
OpenDocument drawing OpenOffice.org Draw
ODIF
Open Document Interchange Format
ODL
Object Description Language
ODL
Type library source Visual C++
ODM
OpenDocument master document OpenOffice.org Writer
ODP
OpenDocument presentation OpenOffice.org Impress
ODS
OpenDocument spreadsheet OpenOffice.org Calc
ODT
OpenDocument text document OpenOffice.org Writer
OFD
Form definition ObjectView
OFF
Object File Format vector graphics file
OFF
Object File Format vector graphics
OFM
PostScript font description file
OFN
Microsoft Office documents Microsoft Office
Ogg multimedia container format
OHB
Source On Hand Basic
OHS
Outbound History Bink/+
OIF
QuickBase file format
OKT
Music (8 channels) Oktalyzer
OKT
Music format Oktalyzer
OLB
Object library VAX
OLD
Backup file
OLI
Text file Olivetti
OLSR
Configuration file olsrd
OMA
Audio file Labelgate CD 2, MAGIQLIP2
OMG
Audio file Sony compressed audio file (ATRAC3)
OOF
Data Outrage 3D Object Format (Descent)
OOG
Data WEBOOGL 3D object
OOM
Swap file Shroom
OPJ
Origin Project File Origin version 4.1 and later
OPN
Active options Exact
OPT
Options name used by many programs for configuration information
OPT
Delphi project options Borland Delphi
OPT
Optimize support file QEMM
OPW
Organization chart Org Plus for Windows
OPX
Inactive options Exact
ORA
Parameter file Oracle
ORC
Orchestra MIDI file CSound
ORG
Calendar file Lotus Organizer
ORG
Older Origin Project Origin versions 4 or earlier
OTG
OpenDocument drawing template OpenOffice.org Draw
OTB
Over-the-air bitmap graphics
OTF
Subtitle font information for media content Media players / software which support PGS subtitling
OTH
OpenDocument HTML document template OpenOffice.org
OTL
Outline font description Z-Soft Type Foundry
OTL
Ventura Publisher's Type Foundry Outline Editor format
OTP
OpenDocument presentation template OpenOffice.org Impress
OTS
OpenDocument spreadsheet template OpenOffice.org Math
OTT
OpenDocument text document template OpenOffice.org Writer
OTX
Text file Olivetti Olitext Plus
OUT
Output file
OV1
Overlay file (part of program to be loaded when needed)
OV2
Overlay file (part of program to be loaded when needed) TomTom Point of Interest
OVD
Datafile ObjectVision
OVL
Overlay file (part of program to be loaded when needed)
OVR
Overlay file (part of program to be loaded when needed)
OXT
OpenOffice.org extension OpenOffice.org

P

Ext. Description Used by
P
Database PROGRESS source code PROGRESS
P PASCAL source code file
P Parser source code file
P Picture file APPLAUSE
P Rea-C-Time application parameter file ReaGeniX code generator
P0?
Split archive UC2 SAS.EXE
P10
Tektronix Plot GCGW
P10 Certificate Request
P12
Personal Information Exchange "Crypto Shell Extensions"
P16
Music (16 channels) ProTracker Studio 16
P22
Patch file (Patch22) Patch22
P80
PLM-80 source
P86
PLM-86 source
p2v
Backupfile of a project in eventplanning software plan2viz (windowsbased)
P3T
PlayStation 3 Theme file PS3 Theme settings menu
PA1
Worktable PageAhead
PAC
SBStudio II Package or Song SBStudio II
PAC STAD Image (graphics ?)
PACK
PACKAGE
Contents The Sims 2 - Spore - The Sims 3
PAD
Automatic print definitions Produa
PAD Keypad definition Telemate
PAF
For Personal Ancestral File data files
PAGES
Pages document file Pages (Apple iWork '08)
PAK
Archive Pak
PAL
Palette file Microsoft Draw - Win. Paintbrush - many
PAL Palette file Diablo II
PAN
Printer-specific file (copy to coreldrw.ink) CorelDRAW
PAR
Parameter file Fractint
PAR PARTS application Digitalk PARTS
PAR
Permanent output file Windows 3.x
PAR Parity Archive
PAR2
Parity Archive v2
PART
Part of a download file
PAS
Pascal language source Borland Pascal
PAT
Gravis Ultrasound Patch Convert (c) Villena
PAT Hatch patterns AutoCAD - Photostyler
PAT Vector fill files CorelDRAW
PAT Pattern File Photoshop
PAT GIMP pattern
PB
Fax FAXability Plus
PB Phonebook WinFax Pro
PB Proboard Conf. files Proboard
PB Setup file PixBase
PB1
Document First Publisher for Windows
PBA
Powerbasic BASIC source code Genus
PBD
Phone book FaxNOW! - Faxit
PBD
Molecule (protein data bank)
PBI
Powerbasic include file Genus
PBI
Profiler Binary Input Microsoft Source Profiler
PBK
Microsoft Network Phone book MSN
PBL
Powerbasic library Genus
PBLIB
Power Library PowerBASIC
PBM
PBM Portable Bit Map graphics format Jasc Media C.
PBM
Planar bitmap graphics XLib
PBO
Profiler Binary Output Microsoft Source Profiler
PBT
Profiler Binary Table Microsoft Source Profiler
PC
Text file containing IBM PC specific info
PC3
Custom palette Harvard Graphics 3.0
PC8
ASCII text IBM8 character set NewWave Write
PCA
Perfect Clarity Audio Sony Vegas Pro
PCB
P-CAD database P-CAD, PCBExpress, and other Printed Curcuit Board design software
PCB
Artwork design file (Circuit board design) Zuken CadStar
PCC
Cutout picture vector graphics PC Paintbrush
PCD
Graphics format (Kodak Photo-CD)
PCD
Kodak Photo-CD Image graphics file (768x512) hpcdtoppm
PCF
Pixel Coordination Format
PCH
Patch file
PCH
Precompiled header Microsoft C/C++
PCJ
Multimedia authoring tool graphics file IBM's Linkaway-Live
PCK
Pickfile Turbo Pascal
PCL
HP-PCL graphics data file HP Printer Control Language
PCM
OKI MSM6376 synth chip PCM AWAVE
PCM
PCM Authorware
PCS
Microsoft PowerPoint picture package Microsoft PowerPoint - Microsoft ClipArt Gallery
PCS
PCSurvey file PCSurvey by Softart - Land Surveying Software
PCT
Bitmap graphics file Macintosh b&w PICT1 - color PICT2
PCW
Text file PC Write
PC paintbrush bitmap format QPeg - Display - ZSoft - PC Paintbrush
PDA
Bitmap graphics
PDB
Packrat 5.0 data file Packrat 5.0
PDB container format (envelope) for Palm OS databases Palm OS, Garnet OS, Access Linux Platform, e-book
PDB debugging data Microsoft Windows
PDB Molecule (protein data bank)
PDD
Adobe Photoshop Elements Image Adobe Photoshop Elements
PDE
Pathology Data Exchange
PDE
data PowerDesk Encrypted
Adobe's Portable Document Format Adobe Acrobat Reader
PDF
Graphics file (ED-SCAN 24bit format)
PDF
Package Definition File
PDF
PCAD Database Interchange Format Pdifin.exe - Pdifout.exe
PDF
Print device information Netware
PDG
Print Shop Deluxe data file
Portable Database Image
PDL
Project Description Language file Borland C++ 4.5
Program Deskmate
PowerDesigner's physical data model (relational model) file format PowerDesigner
Visual Basic (VB) Project Information File Visual Basic
PDN
Image file Paint.NET
PDS
PALASM Design Description
PDS
Pds graphics
PDS
Planetary Data System Format
PDS
Pldasm source code file (hardware assembly)
PDV
Printer driver Paintbrush
PDW
Document Professional Draw
PEB
Program Editor bottom overflow file WordPerfect Library
PED
Program Editor delete save WordPerfect Library
PEM
Program Editor macro WordPerfect Library
PEQ
Program Editor print queue file WordPerfect Library
PER
Program Editor resident area WordPerfect Library
PES
Program Editor work space file WordPerfect Library
PET
Program Editor top overflow file WordPerfect Library
pet
package[7] Puppy Linux
PEX
Proboard EXecutable file (Executed from PB) Proboard
PFA
PostScript Font File
PFA
Type 3 font file (unhinted PostScript font)
PFB
Adobe Acrobat document Adobe Acrobat Reader
PFB
PostScript font Adobe Type Manager (ATM)
PFC
(Personal File Cabinet) contains e-mail, preferences and other personal information AOL
PFC
Text file First Choice
PFK
Programmable function keys XTreePro
PFM
Windows Type 1 font metric file
PFS
Database (PFS:FILE) - text file (PFS:Write) PFS
PFT
Printer font ChiWriter
PG
Page cut/paste file IBM LinkWay
PGD
PGP cripted disk
PGI
Printer Graphics File device driver PGRAPH library
PGL
HP Plotter vector graphics format
PGM
Graphics format (Portable GrayMap) JASC Media C.
PGM
Program Signature
PGP
Support file Pretty Good Privacy RSA System
PGS
Manual page man4dos
PH
Optimized .goh file Geoworks
PH
Perl header file
PH
Phrase-table Microsoft C/C++
PHD
PolyHedra Database
PHM
Phone book DN - Lync
PHN
Phone list UltraFax - QmodemPro
PHO
Phone database Metz Phone for Windows
PHP
PHP file
PHP3
PHP 3 file
PHP4
PHP 4 file
PHF
Database File Nuverb Systems Inc: Donarius
PHR
Phrases LocoScript
PI2
Portrait Innovations High Resolution Encrypted Image file Portrait Innovations Studio2 (proprietary)
PIC
123 Vector graphics format CShow - Alchemy - Paint (Pictor)
PIC
Bitmap graphics file Macintosh b&w PICT1 - color PICT2
PIC
Lotus picture
PIC
PIXAR picture file SDSC Image Tool
PICT
Macintosh Picture
PIE
GlovePIE script file GlovePIE
PIF
OS/2 graphics metafile PICVIEW.EXE
PIF
Program Information File Windows 3.x
PIF
Vector graphics GDF format file (IBM mainframe computers)
PiM
Pascal Text Mode Image File The Ultimate Draw
PIT
Compressed Mac file archive created by PACKIT unpackit.zoo
PIV
Pivot Stick Animator file Pivot Stick Animator
PIX
Alias image file SDSC Image Tool
PIX
Inset Pix
PJ
Project CA-SuperProject
PJT
Additional (FPT) project description file FoxPro
PJX
Main (DBF) project description file FoxPro
PK
PacKed bitmap font bitmap file (TeX DVI drivers)
PK
Peak file Cool Edit
Quake 2 data file id Software
Quake 3 data file id Software
Doom 3 and Quake 4 data file id Software
PKA
Archive PKARC
Installer script Next, Mac OS X, Sony PS3
PKG
P-CAD database P-CAD
PKT
Fido message packet FTN software
PL
Palette Harvard Graphics
PL
Perl source code file
PL
Prolog source code file
PL
Property List font metric file TeX
PL1
Room plan 3D Home Architect
PL2
Palette Diablo II
PL3
Chart palette Harvard Graphics 3.0
PLA
Playlist
PLB
FoxPro library FoxPro
PLB
P-CAD library P-CAD
PLC
Add-in file (functions - macros - applications) Lotus 1-2-3
PLC
P-CAD database P-CAD
PLD
PhotoLine Document PhotoLine image processing
PLE
Encrypted Chat Log Messenger Plus! Live Plugin - Log viewer
PLIST
Mac OS Property List, also used on iOS, NeXTSTEP, and GNUstep Apple's Property List Editor
PLL
Prelinked library CA Clipper
PLM
DisorderTracker2 music module AWAVE
PLN
Spreadsheet WordPerfect for Win
PLP
Playlist
PLP
Messenger Plus! Sound Pack Messenger Plus! Live Plugin
PLS
Playlist file WarpVision (OS/2)
PLSC
Messenger Plus! Script Pack Messenger Plus! Live Plugin
PLSK
Messenger Plus! Skin Pack Messenger Plus! Live Plugin
PLT
HPGL plotter file vector graphics AutoCAD
PLT
Output file for ploter
PLT
P CAD: Output file editor for PCPLOT or PCPRINT P CAD
PLT
Page Magic 2.0 paper format Page Magic 2.0
PLT
Palette
PLT
Table for .pll CA Clipper
PLY
Data PopMail
PLY
Presentation screen Harvard Spotlight
PLY2
Data PLY2 object
PLY
ZipPack
PM
Auran Jet progressive mesh file (obsoleted by IM and LM) Trainz
PM
Perl module
PM
Bitmap graphics Presentation Manager
PM3
PageMaker 3.0 data file PageMaker 3.0
PM4
Document PageMaker 4
PM5
Aldus PageMaker 5.0 publication Aldus PageMaker
PMC
Graphics A4TECH Scanner
PMI
OS/2 V3 SVGA PMI-File Svga.exe
PMI
PhatPad note PathWare
PMM
Program file Amaris BTX/2
PMP
PhotoMorph Project PhotoMorph
PN3
Printer device driver Harvard Graphics 3.0
Portable Network Graphics
PNF
Pre-compiled Setup Information file Microsoft Windows
PNM
PBM Portable aNy Map graphics file
PNT
Macintosh painting
PNT
Pointlist segment FTN software
PNT
QWK reader pointer file MarkMail 2.x
POF
Altera FPGA programming file (External Flash) Altera Quartus
POH
Optimized .goh file Geoworks
POL
InnovMetric Software Polygon Models Format
POLICY
Group Policy File Microsoft Windows
POLY
Data Patrick Flynn's Poly Format - 3D object
POP
Messages index PopMail
POP
Pop-up menu object dBASE Application Generator
POT
Microsoft PowerPoint template
POV
Raytraced graphics image Persistence Of Vision
POW
Power Chords instrument/song file Power Chords
PP
Amiga archive POWERPACKER
PPA
Microsoft PowerPoint Add-in
PPB
Button bar for Print Preview WordPerfect for Win
PPD
PostScript printer description file
PPJ
Premiere Project Premiere
PPK
Archive (using for many distributives) PPK
PPL
PolaroidPalettePlus ColorKey device driver Harvard Graphics 3.0
PPM
Graphics format (Portable PixelMap) JASC Media C.
PPO
Preprocessor output CA Clipper 5.*
PPP
Publication PagePlus
PPS
Storyboard Personal Producer
PPS
Microsoft PowerPoint Slideshow (stand alone slideshow)
PPT
Microsoft PowerPoint Presentation Microsoft PowerPoint
PPTX
Office Open XML Presentation
PR1
Packrat 4.0 data file Packrat 4.0
PR2
Packrat 4.x data file Packrat 4.x
PR2 Presentation Aldus Persuasion 2.x
PR2 Printer driver dBASE IV
PR3
PostScript printer driver dBASE IV
PR3 Presentation Aldus Persuasion 3.x
container format (envelope) for Palm OS databases Palm OS, Garnet OS, Access Linux Platform, Mobipocket
PRC "Product Representation Compact", for embedding 3D data in a PDF file CAE and CAM applications
PRD
Printer driver
PRE
Presentation Freelance Graphics
PRE
Settings Programmer's WorkBench, Microsoft C/C++
PRE
Stork graphic file
PRF
CheckIt Pro v1.0 data file CheckIt Pro 1.0
PRF
Pixel Run Format graphics file Improces - Fastgraph
PRF
Printer driver dBASE IV
PRF
Profiler output
PRG
Program source code (e.g. Clipper language) CA Clipper
PRG
Program source dBASE IV - FoxPro - Clipper 5 - dBFast
PRG
Program Atari
PRI
Printer definitions LocoScript
PRJ
Borland C++ IDE project file BC.EXE - BCW.EXE
PRK
SimPark Saved File SimPark
PRM
Parameters
PRN
Printer driver Signature
PRN
Text file Lotus 1-2-3 - Symphony
PRN
Usually printer output file
PRO
Profile used by many programs to store configuration data
PRO
Graphics profile file DOS
PRO
Proboard conf. file Proboard
PRO
Prolog language source
PRO
PROLOG source code file
PROJ
Project File (Interface Builder) NeXT
PROPERTIES
Java properties file Java applications
PROTO
Message specification Google Protocol Buffers
PRR
The Perfect Resume data file Perfect Resume
PRS
Norton Viewer DLL file
PRS
Presentation Harvard Graphics Win
PRS
Printer Resource e.g. fonts WordPerfect for Win
PRS
Procedure dBASE IV
PRT
P-CAD component P-CAD
PRT
Part or Drawing Cadkey
PRT
Printer driver Dr. Halo
PRX
Compiled program FoxPro
PS
Document in PostScript format adobe
PSA
Archive (Pretty Simple Archive) PSA.OUT (GNU)
PSB
For big Photoshop files Photoshop Document
PSD
Periscope Debbuger Def file Periscope
PSD
Photoshop bitmap file Photoshop document
PSE
see PSEG
PSEG
Bitmap graphics IBM printer Page SEgment
PSF
Outline PostScript printer font ChiWriter
PSM
Music format (Protracker Studio Module) Protracker - MASI
PSM
Symbol table of IDE Turbo Pascal
PSM
3D Model 18 Wheels Of Steel
PSN
Presentation file for Sound Script Win
PSP
image file with layers Paint Shop Pro (all versions)
PSQ
Premiere Sequence Premiere
PST
Postbox file BMail
PST
Archive File Microsoft Outlook
PSV
PlayStation 2/PlayStation 3 saved game PlayStation 2 and PlayStation 3
PSW
File w/ passwords for any program/game many
PT
Game crack Player Tools
PT
Kodak Precition Color Management System
PT3
Device driver Harvard Graphics 3.0
PT3
Template PageMaker 3
PT4
Template PageMaker 4
PT5
Aldus PageMaker 5.0 publication template Aldus PageMaker
PTB
Power Tab Software Power Tab Editor
PTB
Script PubTech BatchWorks
PTF
PlayStation Portable Theme file PSP Theme settings menu
PTF
ProTools Session File Digidesign ProTools
PTG
Panasonic Title Graphics
PTL
Premiere Title Premiere
PTM
Macro PubTech BatchWorks
PTM
Music format
PTM
Page Magic 2.0 template Page Magic 2.0
PTN
Pattern Cadkey
PTN
Pattern CarveWright/CompuCarve Designer
PTR
OS/2 cursor image file ICONEDIT.EXE
PTR
QWK reader pointer file QMail
PTU
Performer Terrain Utilities
PUB
Package File Exstream Dialogue
PUB
Page template Microsoft Publisher
PUB
Public key ring file Pretty Good Privacy RSA System
PUB
Publication Ventura Publisher - 1st Publisher
PUD
Warcraft II Map file Warcraft II
PUT
Archive PUT
PUT
Graphics format WScan
PVD
Script Instalit
PVL
Library Instalit
PVM
Texture Files PVMEdit
PVT
Local Fidonet pointlist FTN software
PW
Text file Professional Write
PWF
Workflow Files Mac OS X Server Podcast Producer
PWK
Workspace File PolyWorks
PWL
Password List
PWP
Text document Professional WritePlus
PX
Paradox 3.0 file Paradox 3.0
PXP
3DS Process file 3D Studio
PXR
Pixiar Picio AltamiraComposer
PXZ
Compressed file to exchange media elements PSALMO
PY
Python script file Python interpreter
PYC
Compiled Python module Python interpreter
PYI
Cognos Powerplay Model
PYO
Optimized compiled Python module Python interpreter
PZD
Default settings Pizazz Plus
PZI
Graphics format PZP
PZO
Overlay file Pizazz Plus
PZP
Palette Pizazz Plus
PZS
Settings Pizazz Plus
PZT
Transfer file Pizazz Plus
PZX
Swap file Pizazz Plus

Q

Ext. Description Used by
Q0
Q0 graphic file
Q3S
Data Quick3D Scene
QAG
Quick Access Group Norton Desktop
QAP
Application Omnis Quartz - Omnis Studio
QB
Tony Hawk's Pro Skater series scripting files
QBB
Quickbooks Backup File
QBE
Saved query (Query By Example) dBASE IV - Quattro Pro
QBO
Compiled query dBASE IV
QBW
Spreadsheet QuickBooks for Windows
QCH
Qt Compressed Help Trolltech Qt Assistant
QCP
Mp3 extension on Motorola ringtones Motorola Phones
QDF
Data file Quicken data file
QDK
Backup of startup files created by Optimize QEMM
QDn
Data file - segment n Omnis Quartz- Omnis Studio
QDV
Graphics file Steve Blackstock Giffer
QDR
Configuration file Q-Dir
QEF
Query file Q+E for Microsoft Excel
Quicken-specific implementation of the OFX specification Intuit Quicken
QFX
Fax QuickLink
QG3
Data QuickMem Greek
QHC
Qt Help Collection Trolltech Qt Assistant
QHCP
Qt Help Collection Project Trolltech Qt Assistant
QHP
Qt Help Project Trolltech Qt Assistant
Quicken Interchange Format Intuit Quicken
QIZ
World book quiz World Book
QLB
Quick library Microsoft C/C++
QLC
ATM Type 1 fonts script Adobe Type Manager
QLP
Printer driver QuickLink
QM4
Options or services file QMail 4.x Mail Door
QPR
Generated query program FoxPro
QPR
Print queue device driver OS/2
QPX
Compiled executable QBE query file FoxPro
QRS
Equation Editor support file WordPerfect for Win
QRT
Graphics format (QRT ray tracing)
QRY
Query dBASE IV
QT
QuickTime movie (animation)
QTVR
QuickTime VR Movie
QUOX
Question Object Document Quobject Designer and Quobject Explorer
QVD
QlikView Document (Data) QlikView Compressed Database File
QVW
QlikView Document (View) QlikView Presentation File
QWK
QWK reader message file
QXD
Document QuarkXPress
QXL
Element library QuarkXPress

R

Ext. Description Used by
R
Ratfor file
R
Script file R
R00, R01, ...
Part of a multi-file RAR archive.
R2D
Reflex 2 datafile Reflex 2
R3D
Red Raw Video (raw video data created with a Red camera) Red Camera
R8
Raw graphics file (one byte per pixel) plane one PicLab
R8P
PCL 4 bitmap font file Intellifont
RA
Remote Access conf. files RA
RA0, RA1, ...
Part of a multi-file RAR archive.
RAD
2-op FM music Reality AdLib Tracker
RAD
Radiance
RAL
Remote Access Language file Remote Access
RAM
Ramfile RealAudio
Archive RAR
RAS
Graphics format SUN Raster
RAT
Datafile (RATS)
RAW
HSI raw graphic file
RAW
PCM Signed Raw Sound File
RAW
QRT graphic file
RAY
Rayshade
RB
Ruby Script file
RBF
Datafile Rbase
RBLX
ROBLOX model ROBLOX
RC
Configuration file emacs
RC
Resource Compiler script file Microsoft C/C++, Borland C++
RC
Resource Script Resource Writer
RC
UUPC configuration files UUPC
RC
Windows resource compiler script RC.EXE -Resource WorkShop - OS/2
RCG
Netscape newsgroup file (netsc.rcg)
RData
Data file R
RDF
Compiled UIC source code Geoworks UI Compiler
RDI
Device-independent bitmap file (RIFF RDIB format)
RDP
RDP connection Remote Desktop connection
RDX
Datafile Reflex
REC
Archivation protocol ARCSERVE
REC
Datafile EpiInfo
REC
Record file Sprint
REC
Windows Recorder Macro File WinRecorder
RED
Path info Clarion Modula-2
RED
REDuced nodelist file T-Mail nodelist Compiler
REF
Cross-reference
REG
OLE Registration file Windows 3.x
REG
Registration information or key
REL
Foreground job relocatable file RT-11
REM
Remarks definition Sourcer
REM
Remarks
REP
QWK reader reply file
REP
Report file used by many applications
REP
Report Report Designer - CodeReporter - DataBoss
REQ
File request FTN Software
RES
Compiled resource Microsoft C/C++, Borland C++
RES
DBASE resources dBASE IV
RES
Windows compiled resource package Win
REV
Revision file Geoworks
REX
PharLab executable file (old format) PharLab
REX
Report definition Oracle
REX
Rexx language source file Rexx
REZ
Resource file
RF
Sun raster graphics file
RFM
Report ForMat (script for customized report) Nuverb Systems Inc: Donarius
RFT
DCA/RFT Revisable Format Text file IBM DisplayWrite 4.0-5.1
RGB
SGI RGB image file (RAW) SDSC Image Tool
RGX
Symbol tables etc. info ReaGeniX code generator
RH
Resource header file Borland C++ 4.5
RH
Windows resource file header RC.EXE
RHistory
Command history logfile R
RI
Data Lotus 1-2-3
RIB
Graphics (Renderman Interface Bytestream) 3D Reality
RIC
Fax Ricoh
RIF
RIFF bitmap graphics (Resource Interchange File Format) Fractal Design Painter
RIP
TeleGrafix Remote Imaging Protocol Maximus 3.0
RIX
Graphics (ColoRIX Image File) ColoRIX
RL4
Bitmap graphics
RL8
Bitmap graphics
RLA
Wavefront raster image file SDSC Image Tool
RLB
Data hgw.rlb Harvard Graphics Win
RLC
Graphics 1bit/pixel scanner output
RLD
Norton Commander 5.0 temp file NC 5.0
RLD
OSIMapDef. RecLoad Definition
RLE
Utah Run Length Encoded rasterfile graphic file SDSC Image Tool
RLZ
REALIZER source code file CA-Realizer
RM
Real Media Real Player
RMB
data RegistryMaster
RMI
Windows alternate synthesized sound format RIFF RMID format
RMK
Make file CA Clipper - RMAKE
Real Media Variable Bitrate Real player
RN
XPL program for Nota Bene users
RNA
lime Network Real Native Application File All lime Network Applications
RND
Rendering Slide AutoCAD AutoShade
Rnn
Multi volume RAR archive RAR
RNO
Runoff file VAX
ROL
FM music Adlib Music File Roland
ROM
Read Only Memory image in emulators, AONs, etc.
ROO
CODASYL DBMS Database Root Oracle
RPB
Data report file used by CP Backup CP Backup
RPD
Database RapidFile
RPF
AutoCAD pattern ACAD
RPL
Text document Replica
RPM
Red Hat Package Manager Red Hat Linux
RPT
Report file used by many applications
RRD
Reduced Resolution Dataset ESRI (GIS)
RS
Data file Amiga Resource - Reassembler
RS_
Resource fork of a Macintosh file Mac-ette
RSC
Resource file ViewMax - many
RSL
Application - Project resolver one
RSL
Resource Library used by PC Tools for Windows PC Tools - Win
RSP
Response file (text file containing input expected by e.g. LINK)
RSP
Response File OS/2
RSY
FLEXIT Multishot Survey Raw Data file FLEXIT
RTF
Rich Text Format text file (help file script) many - Microsoft Word
RTFD
RTF-Packet NeXT
RTL
HP RTL graphic file
RTL
Run-Time library Norton Utilities
RTL
Text file
RTP
RTPatch software update package data file Pocket soft patch
RTS
Realizer executable file
RTS
Runtime library file CA-Realizer
RUL
Echo-conference rules
RUN
PC Tools for Windows batch file PC Tools
pseudo-executable file, used in Portable Apps and software installers for Super OS RUNZ Framework
RUS
Russian text
RV
Mobile pricelist data file Mobile
RVF
TRichView
RVW
Review
RWS
Borland Resource Workshop symbol file Resource Workshop
RWS
Resource Workshop data file Borland C++
RWX
Criterion RenderWare
RWX
MEME Shape File
RWX
Script RenderWare
RWZ
Microsoft Outlook Rules Wizard File Microsoft Outlook
RXD
Reflex 1 datafile Reflex 1
RZK
File Crypt password file All text editors
RZX
File Crypt encrypted file File Crypt (Akte Krypta, Kriptirnik)

S

Ext. Description Used by
S$$
Temporary sort file Sprint
S
ASSEMBLY source code file unix
S
Multi Edit macro file source Multi Edit
S
MSTS Shape file MSTS
S19
Motorola ASCII format of executables
S1K
S1000 Simnet Format
S3I
Digiplayer/ST3 Sample File Digiplayer - ST3
S3M
Music (16 channels) Scream Tracker 3.0 - DMP
S7I
Seed7 library / include file Seed7 interpreter and compiler
SA?
Packed mail FTN software
SAB
Saber file Star Wars: Jedi Knight Jedi Academy
SAF
see SAIF
SAFE
SafeIT Encrypted
SAIF
Spatial Archive Interchange Format
SAL
Datafile SORITEC
SAN
LucasArts' SMUSH/INSANE animation
SAM
Ami Pro data file Ami Pro
SAM
Text file Samna - Lotus Ami/Ami Pro
SAP
Atari SAP music format.
SAR
Archive SAR
SAT
ACIS
SATS
Static source ATS
SAV
Backup file (saved file)
SAV
Configuration
SAV
Executable RT-11
SAV
SPSS "System File" PSPP
SAV
Saved game state Spider Solitaire (Windows)
SAVER
Screensaver Mac OS X
SB
Audio file (signed byte)
SB
Raw Signed Byte (8bit) data AWAVE
SB
Raw Signed PCM Byte 8bit data AWAVE
SB
Scratch project Scratch
SBD
Storyboard Storyboard Editor
SBH
Header ScriptBasic
SBI
Sound Blaster Instrument file (Creative Labs)
SBK
Emu SoundFont Bank (AWE32 Bank) Convert (c) Villena
SBL
Stony Brook Pascal library SB Pascal
SBP
DML program Superbase 4
SBR
Support file Source Browser
SBT
Notes related to record Suberbase 4 Windows
SC
Display driver Framework II
SC
PAL script Paradox
SC
Script Borland Paradox
SC3
Renamed dBASE III screen mask file dBASE IV
SC3
Screen device driver Harvard Graphics 3.0
SC3
Saved City SimCity 3000
SC4
Saved City SimCity 4
SC4
Game Scenario RollerCoaster Tycoon Deluxe/Expansion Pack
SCA
Datafile SCA
SCC
Text file
SCD
SCODOL film recorder (Scan Conversion Object Description Language) SCODOL
SCF
Standard Chromatogram Format DNA Baser Assembler
SCF
Standard Chromatogram Format Staden package
SCF
? SimAnt or SimTown ??
SCF
Windows Explorer Command (e.g.: show desktop.scf) Windows Explorer
SCF
Multimedia show ScoreMaker
SCF
Spelling checker configuration file Symphony
SCH
Project schedule Schedule Publisher
SCH
Circuit Design Schematic P-CAD - Orcad - Protel
SchDoc
Circuit Design Schematic Protel - Altium Designer
SCI
Fax SciFax
SCI
System Configuration Information
SCM
Scheme source code file
SCM
Schematic file (Circuit Diagram for PCB design) Zuken CadStar
SCM
StarCraft mission
SCN
SCeNe RTrace
SCN
Screen file Kermit
SCO
High score
SCP
Script BITCOM
SCR
Any other screen system
SCR
DEBUG source code file DOS Debug
SCR
Forth screen (source) file Forth
SCR
Screen - screen snapshot dBASE IV - Procomm Plus
SCR
Screen font LocoScript
SCR
Screen saver Windows 3.x
SCR
Screen snapshop
SCR
Script file source TeleMate - Kermit - 1st Reader
SCT
Additional (FPT) screen description file FoxPro
SCTOR
Raster graphics format used by some very obscure custom operating systems.
SCX
Chart Stanford Chart
SCX
Graphics format ColoRIX
SCX
Main (DBF) screen description file FoxPro
SCX
StarCraft: Brood War scenario StarCraft: Brood War
SCY
Security file ReaGeniX
SD
Sound Designer I audio file AWAVE
SD7
Seed7 source file Seed7 interpreter and compiler
SDA
Fidonet's Software Distribution Network file archive description
SDC
Video DigimaxMaster - Samsung NV3
SDC
Synopsys Design Constraints Electronic Design Automation Tools
SDF
Microsoft SQL Server Compact Edition database file
SDF
Flight data microdrones GmbH
SDF
Source definition file Sourcer
SDF
System Data Format file (fixed length ASCII text)
SDI
Software Distribution Network Info file
SDK
Roland S-550/S-50/W-30 Disk Image
SDL
Alias Wavefront Scene Description Language
SDM
Signed Differential Mapping brain maps and/or distributions Signed Differential Mapping
SDML
Spacial Data Modeling Language
SDN
Software Distribution Network compressd file archive pak251.exe
SDR
SmartDraw File SmartDraw Pro
SDS
MIDI Sample DUMP Standard File
SDTS
Spatial Data Transfer Standard
SDW
Ami Draw Symbol File
SDX
Sample DUMP Exchange File
SEA
Self-Extracting compressed Macintosh file Archive
SEC
compressed file
SEC
Diskreet encrypted file Diskreet
SEC
Secret key ring file Pretty Good Privacy RSA System
SEC
Secured animation file Disney Animation Studio
SED
Self extraction directive file IExpress
SEN
Scifer Archive Format (Internal Header Mode)
SEP
Printer separator page
SEQ
ABI Text Sequence Applied Biosystems
SEQ
Atari animation file
SEQ
Video Tiertex video sequence
SEQ
Sequential Instruction File Bubble Chamber
SES
Session info Clarion Modula-2
SES
Multitrack Audio Session info Adobe Audition
SET
Configuration file 1st Reader
SET
Driver sets created by Install Symphony
SET
Extension used by Norton Backup and CPS Backup for setup info Norton Backup - CPS Backup
SET
Hump Assignments File FYM
SET
Setup options file
SET
YVD card set file YVD
SF
IRCAM Sound File CSound package - MixView sound sample editor
SF
JAR Digital Signature
SF
WPS attribute storage (OS/2 WorkPlace Shell) wp_root.sf OS/2 WorkPlace Shell
SF2
Emu SoundFont Bank v2.0 file AWAVE
SFB
HP Soft font (obsolete under Windows)
SFD
SoundStage Data file AWAVE
SFF
Standard Flowgram Format DNA Baser SFF Workbench tool
SFF
Scene File Format
SFI
Graphics SIS Framegrabber
SFI
Printer font (HP LaserJet landscape) Ventura Publisher
SFL
PCL 4 bitmap font (landscape) landscape - Intellifont - Ventura Publisher
SFL
Sound file Sound Forge and ACID Pro
SFN
Font SPX
SFO
Bitstream font file - fontware format
SFP
PCL 4 bitmap font portrait - Intellifont - Ventura Publisher
SFR
Sonic Foundry Sample Resource AWAVE
SFS
PCL 5 scalable font file Intellifont
SFT
Screen font ChiWriter
SFX
SFX (self-extracting archives) script RAR
SG1
Graphics Stanford Graphics
SGF
Document with graphics Starwriter
SGI
Graphics file IRIS - Silicon Graphics
SGP
Statistics STATGRAPHICS Plus
SGT
Save/get keyboard macro Signature
SH
ASCII archive SHAR
SH
Unix shell script
SH3
Presentation Harvard Graphics 3.0
SHAR
Archive UNSHAR (Unix)
SHB
Background CorelShow
SHG
Segmented Hyper Graphics Microsoft's shed.exe, JGsoft's Hotspot Builder, EC Software's Help and Manual
SHK
Apple II archive SHRINKIT
SHM
Shell macro WordPerfect Library
SHP
Shape file and source file for text fonts

ESRI shapefile

AutoCAD

ArcGIS

SHR
see SHAR
SHT
HTML format for WWW NetScape
SHW
Presentation Harvard Graphics 2.0 - CorelShow
SHW
Slide show WordPerfect Presentations
SHX
Shape entities

ESRI shapefile

AutoCAD

ArcGIS

SIB
Sibelius file Sibelius 1-5
SIF
Setup Installation Files info Windows NT Setup
SIG
Current program settings Signature
SIG
Signature file ThunderByte AntiVirus - PopMail
SIK
Backup file (Sicherungskopie) Microsoft Word
SIM
Simon document file - Simon instruction software editor
SIS
symbian file
SIT
Archive (Macintosh) STUFFIT
SKP
Google SketchUp file
SKY
SYLK Spreadsheet file (used by Multiplan)
SL
S-Lang source code file
SLB
P-CAD library (symbols) P-CAD
SLB
Slide library AutoCAD
SLC
SALT (script from Telix) compiled code Telix
SLD
Slide AutoCAD
SLDPRT
Part SolidWorks
SLDASM
Assembly SolidWorks
SLDDRW
Drawing SolidWorks
SLI
Slide MAGICorp Slide Service
SLK
Microsoft Excel import format Microsoft Excel
SLK
SYLK Symbolic Link format data file MultiPlan
SLL
Sound data file
SLL
Static Link Library PowerBASIC
SLP
SLP command file created by SRCCOM RT-11
SLP
Localization project file Sisulizer
SLT
SALT Script Application Language for Telix script source Telix
SLV
Solution for any game many
SM
Maillist SoftSpoken Mailer
SM
Script ScriptMaker
SM
SMALLTALK source code file
SM
Text file Samna Word
SM
StepMania Step File StepMania
SMC
Super MagiCom SNES ROM image Super MagiCom
SMCLVL
Secret Maryo Chronicles Level Secret Maryo Chronicles
SMF
Fax SMARTFAX
SMF
3D World Studio mesh files
SMK
Smacker Video Format (RAD Video)
SML
System Macro Library RT-11
SMM
Ami Pro Macro File Ami Pro
SMN
Font (ParaGraph's WorkScript format)
SMP
Sample (sound file)
SMP
Samplevision File Samplevision
SMPL
Data Megahedron 3D object
SMS
MSTS Sound management system file MSTS
SMT
Text file Smart Ware II
SN
Compressed song file Sound Club editor
SND
Digitized sound file Macintosh/ATARI/PC
SND
Power Chords drum sound file Power Chord
SNDB
SQLNotes database SQLNotes
SNG
Song (midi sound) Midisoft Studio - Prism
SNG
Saved game file for StarCraft StarCraft
SNO
SNOBOL4 source code file
SNP
Book-shelf for .BOO READIBM
SNP
Microsoft Access report snapshot
SNP
Output video format from Computer Eyes equipment
SNX
Saved game file for StarCraft: Brood War StarCraft: Brood War
SO
shared object, dynamically linked library Unix
SOAR
Soar Production file
SOF
Altera FPGA programming file (internal RAM) Altera Quartus
SOL
Solution e.g. game walkthroughs
SOL
Adobe Flash shared object ("Flash cookie") (Movie, film, video and multimedia file type) Adobe Flash
SOM
Network serial numbers Quattro Pro
SOM
Sort information Paradox
SON
Song SBStudio II
SOU
Temporary BATCH file RT-11
SOU
SBStudio II Sound File SBStudio II
SOU
Sound data (sound tool)
SP
Archive (unix) SPLINT
SPC
Program Microsoft Multiplan
SPC
Temporary file WordPerfect for Win
SPC
SNES SPC-700 Sound File SNES games
Spectroscopic data (scientific) Thermo Scientific
SPD
Scalable font Speedo - Harvard Graphics 3.0
SPF
Slide presentation file EnerGraphics
SPF
data SQR Portable Format
SPG
Glossary Sprint
SPI
Graphics (Siemens and Philips scanner)
SPIFF
Still Picture Interchange File Format
Spin source file Parallax Propeller Microcontrollers
SPL
Archive SPLINT
SPL
Customized printer driver Sprint
SPL
Divided file segment Slice
SPL
Personal spell dictionary Signature
SPL
Print spooling file Windows 3.x
SPL
Sample
SPM
Data wp{wp}.spm WordPerfect
SPP
Printer file Sprint
SPR
Document letter Sprint
SPR
Generated executable screen file FoxPro
SPR
Sprite
SPR
Story Board sprites
SPS
Exported SyncBack profile SyncBack
SPS
Screen driver Sprint
SPS
SPSSx source code file VAX/VMS
SPT
Data support file (MITAC disk/system management utility pack) MITAC disk/system management utility pack
SPT
SPITBOL source code file
SPW
Worksheet SigmaPlot
SPX
Compiled executable screen file FoxPro
SPX
Ogg Speex bitstream[8] Xiph.Org Foundation
SQD
Squish message base Squish
SQI
Squish message base index Squish
SQL
SQL language code Any SQL database
SQL
Squish message base lastread pointers Squish
SQM
Windows Live Messenger log file
SQN
Note file SquareNote
SQZ
Archive SQUEEZE
SQZ
FOXPRO Squeeze file FOXPRO
SRC
Source code Aurora Compiler
SRC
Multi-edit source Multi-Edit
SRC
Source DataFlex
SRF
Sun Raster File graphics file
SRP
Script QuickLink
SRT
Subtitle format SubRip
SS
Bitmap graphics Splash
SS
Screen saver DN
SSC
Celestia Solar System Catalog file Celestia
SSD
Datafile SAS/PC
SSF
Graphic file SnagIt Studio File/PC
SSG
Saved game Simsig
SSIF
Stereoscopic Interleaved file Media playback devices / software that supports Blu-ray 3D
SSP
Datafile SAS Transport
SSR
FLEXIT Singleshot Survey Raw Data file FLEXIT
SST
AVHRR graphic file
SSV
Spreadsheet viewer file
ST
Instrument library Scream Tracker
ST
SMALLTALK source code file Little Smalltalk
ST
Stamp NeoPaint
STA
Data file Statistica
STA
Saved state Reflection 4.0
STA
Stack Spinmaker Plus
STB
Symbol table file RT-11
STB
Stub library Genus GX Kernel
STC
Celestia Star Catalog file Celestia
STC
OpenOffice.org XML spreadsheet template OpenOffice.org Calc
STD
State Transition Diagram graphic file Prosa
STD
OpenOffice.org XML drawing template OpenOffice.org Draw
STEAMSTART
STEAMSTART file Steam_(software)
STF
Archive SHRINKTOFIT
STF
Setup Table File
STI
OpenOffice.org XML presentation template OpenOffice.org Impress
STK
eBook Starebook
STL
Stereolithography Interface Format
STL
Subtitle files EBU-standard
STM
Music format (4 channels) (Scream Tracker Module) ST - DMP
STM
State Transition Diagram model file Prosa
STO
Pascal stub OBJ file Genus GX Kernel
STP
Subtitler Project Belle Nuit Subtitler
STR
Gate3 table structure file
STR
Structure list object file dBASE Application Generator
STR
PlayStation video file
STS
Music format (Scream Tracker Song) ST 2.0-2.3
STS
Project status info Microsoft C/C++
STU
Studio Project Pinnacle Studio (video editing software)
STUFF
EVE Online compressed file archive CCP hf.
STW
Data file SmartTerm for Windows
STW
OpenOffice.org XML text document template OpenOffice.org Writer
STX
Electronic book SmarText
STX
Music format
STX
Tax form CA-Simply Tax
STY
Ami Pro Template (Style); used by other programs for `styles` Ami Pro
STY
Style library or sheet many
SU?
Packed mail FTN software
SUB
Subtitle format SubViewer; Author David Dolinski
SUF
Sony camera configuration file (setup.suf) XDCAM-EX camcorders
SUI
SUIT library Simple User Interface Toolkit
SUM
Summary
SUN
Sun rasterfile graphics file Sun Microsystems
SUO
Solution User Options Microsoft Visual Studio
SUP
Subtitle file (Blu-ray encapsulated container) SupRip
SUP
Supplementary dictionary WordPerfect for Win
SVC
Represents the ServiceHost instance hosted by Internet Information Services Windows Communication Foundation
SVD
Autosave file for document Microsoft Word
SVG
Autosave file for glossary Microsoft Word
SVG
Scalable Vector Graphics many
SVQ
MRC-Pro sequencers music format Roland Corporation synths such as XP or Fantom series
SVS
Autosave file for style sheet Microsoft Word
SVW
Super Video Windows Conversion Artist
SVX
Interchange, 8SVX/16SV AWAVE
SVY
FLEXIT Survey data FLEXIT
SW
Raw Signed Word (16bit) data AWAVE
SWF
Shockwave Flash Macromedia
SWG
SWAG Pascal Snippets file SWAG
SWP
Document backup Sprint
SWP
Swap file
SWT
Hump Routes File FYM
SXC
OpenOffice.org XML spreadsheet OpenOffice.org Calc
SXD
OpenOffice.org XML drawing OpenOffice.org Draw
SXG
OpenOffice.org XML master document
SXI
OpenOffice.org XML presentation OpenOffice.org Impress
SXM
OpenOffice.org XML formula OpenOffice.org Calc
SXP
3DS Process file 3D Studio
SXW
OpenOffice.org XML text document OpenOffice.org Writer
SY1
SmartPix symbol library Ami Pro
SY3
Harvard Graphics format
SY3
Symbol file Harvard Graphics 3.0
SYD
Backup of startup files created by QEMM (?) autoexec.syd
SYD
Sysedit backup file Sysedit
SYG
Monitor and handler files created by SYSGEN RT-11
SYM
Compiler symbolic information file
SYM
P-CAD component (symbols) P-CAD
SYM
Precompiled headers Borland C++
SYM
Program symbol table Power C, Microsoft ILink incremental linker
SYM
Symbol file Harvard Graphics 2.0, Microsoft Windows SDK
SYN
SDSC Synu image file SDSC Image Tool
SYN
Synonym file Microsoft Word 5
SYS
Datafile SYGRAPH - SYSTAT - SPSS/PC
SYS
System file - device driver or hardware configuration info DOS
SYW
Graphics file (symbol) Harvard Graphics Win
SYW
Yamaha SY-85/SY-99 Wave File Convert (c) Villena

T

Ext. Description Used by
T
Archive without compression (tape) tar
T
TADS source
T
Tester symbol table ReaGeniX code generator
T?H
Turbo Help file (Pascal, C, Assembler, ...) Borland Thelp
T$M
AVG scan log files[9] AVG
T2B
Bookeen Cybook thumbnail Cybook
t2flow
Taverna 2 workflow definition Taverna workbench
T2L
True2Life file format 3D Internet content developers
T44
Temporary file for Sort or Index dBASE IV
T64
Program C64S emulator
TAG
Query tag name DataFlex
TAH
Help file for Turbo Assembler Borland C++
TAL
Adobe Type Align Adobe
TAL
Text illustration TypeAlign
TAP
Tape file ZX Spectrum emulator by g.a.lunter
TAR
Archive TAR
TAZ
Archive WinZipNT - TAR - COMPRESS
TB
Tab file (Virtual Desktop Tab) Tabbery
TB1
Font file Borland Turbo C
TB2
Font file Borland Turbo C
TBF
Fax Imavox TurboFax
TBK
FOXPRO template backup file FOXPRO
TBK
Memo backup dBASE IV - FoxPro
TBK
Toolbook Asymetrix ToolBook
TBL
Short for Table used by many programs
TBL
Aldus TableEditor file TableEditor
TBL
Gate3 table file
TBL
Graphics file (native format) PageMaker TableEditor
TBL
Table of values OS/2
TBR
Norton Desktop custom toolbar NDW
TBS
Text elements ?? (Textbausteine) Microsoft Word
TBX
Table Project Scheduler 4
TBZ
Archive WinZipNT - TAR - Bzip2
TC
Configuration Turbo C - Borland C++
TCH
Help file Turbo C - Borland C++
TCL
Tool Command Language source code Swat
TCT
Drawing Template TurboCAD for Windows
TCW
Native Drawing File TurboCAD for Windows
TD
Config from Turbo Debugger Turbo Debugger
TD0
Compressed diskette in a file Teledisk
TD2
Configuration file Turbo Debugger for Win32
TDB
Database TACT
TDDD
Imagine Object File Format
TDF
Speedo font file
TDF
Typeface definition file Speedo
TDH
Help file for Turbo Debugger Borland C++
TDK
Keystroke recording file Turbo Debugger
TDR
Contens of Arvid tape
TDS
Symbol table Turbo Debugger
TDT
Thumbnail data AVCHD
TDW
Configuration file Turbo Debugger for Windows
TEC
Data TECPLOT output
TEC
TECO macro file ("compiled" form) TECO
TEF
Fax Relisys TEFAX
TEL
Host file Telnet
TEM
Input template IconAuthor
TEM
Turbo Editor Macro Language script Borland C++
TERM
Terminal File
TES
TECO macro file (source form) TECO
TET
Tetris results DN
TEX
Datasheet Idealist
TEX
TeX text file Scientific Word - TeX
TEX
Image Slimtex
TEXT
Text file
TF
Configuration Turbo Profiler
TFA
Area file Turbo Profiler
TFC
Catalogue file Tobi's Floppy Cataloguer
TFF
self executing TansForm dialogue TansForm
TFH
Help file for Turbo Profiler Borland C++
TFM
Tagged font metric file Intellifont
TFM
TeX Font Metric file TeX
TFS
Statistical information Turbo Profiler
TG1
Project file On Target
TGA
Targa True Color bitmapped format Paint.NET
TGZ
Archive WinZipNT - TAR - GNUzip
TH?
Packed mail FTN software
THE
Windows'95 Desktop Theme Microsoft Plus
THM
Thumbnail or Theme File Picture Publisher, PhotoMagic, Canon Digital Cameras, and Sony Digital Cameras will create these Thumbnail files. Also using the same file extension is Sony Ericsson Theme File, for a cell phone.
THP
Nintendo proprietary video format Various Nintendo games
THS
Thesaurus dictionary WordPerfect for Win
Acronis True Image Backup Acronis True Image
TIC
FTN special file with assotiated file description ALLFIX
TIF
see TIFF
TIFF (tagged image format file) bitmapped file Alchemy - PhotoStyler -PageMaker - CorelDRAW
TIL
Fuzzy logic knowledge base Togai InfraLogic Fuzzy-C Compiler
TIP
Digital Signage Presentation Tru-Designer, Tru-Player, Tru-Scheduler part of Tru-i Suite[10]
TIS
Tile set MahJongg 3.0
TJL
Backup file VAXTPU editor
TLB
Interoperability Type Library Win95
TLB
Reference table Bubble Chamber
TLB
Text library VAX
TLB
Type library Visual C++
TLC
Compiled Tool Command Language source code Swat
TLD
Disk Image Teledisk
TLH
Typelib Generated C/C++ Header Visual C++
TLP
Project TimeLine
TLX
Website builder Trellix
TM2
Typical Meteorological Year data (new) Typical Meteorological Year
TMF
Tagged Font Metric file WordPerfect for Win
TMF
TiVo movie TiVo
TMO
ZTG global optimizer default output file Zortech C++
TMO
HandsHigh ThoughtManager Outline ThoughtManager Desktop
TMP
Temporary file ALL PROGRAMS
TMS
TeleMate compiled script TeleMate
TMY
Typical Meteorological Year data (old) Typical Meteorological Year
TMY2
Typical Meteorological Year data (new) Typical Meteorological Year
TOC
Table Of Contents text file (ASCII)
TOK
Borland C++ 4.x reserved word list BCW.EXE
TOPC
TopicCrunch SEO Project file holding keywords, domain and search engine settings (ASCII)
TORRENT
TORRENT File BitTorrent clients (various)
Character file The Only Sheet
TOS
Self-extracting file archive (Atari ST)
TP
Session-state file Turbo Profiler
TP
Turbo Pascal cfg file Turbo Pascal
TP
TinkerPlots Document TinkerPlots and Fathom Dynamic Data Software. Documents contain data tables, graphs, text, pictures, etc.
TP3
Template Harvard Graphics 3.0
TPB
Downloadable PCL Soft font file backup HiJaak
TPC
File produced when an inter-Topicscape topic link file is exported to Windows 3D Topicscape
TPF
Downloadable PCL Soft font file HiJaak
TPF
Print data in EMF format ThinPrint
TPH
Help file Turbo Pascal
TPL
Resident units library Turbo Pascal
TPL
Template file GoldEd -ITrack
TPL
Template Harvard Graphics 2.0
TPOLY
Data TPOLY 3D object
TPP
Protected Mode Units Borland Pascal 7.0
TPT
Digital Signage Presentation Template Tru-Designer, Tru-Scheduler part of Tru-i Suite[11]
TPU
Borland Pascal DOS Mode Library Borland Pascal
TPU
Command file (VAXTPU editor) VAXTPU editor
TPW
Borland Pascal Windows Library Borland Pascal
TPW
Session-state file Turbo Profiler for Windows
TPZ
Archive TAR - GNUzip
TR
Man page input suitable for troff -man cawf2.zip
TR
Session-state settings Turbo Debugger for DOS
TR2
Session-state settings Turbo Debugger for Win32
TRC
Debug support file Power CTrace
TRE
Directory tree file PC-Tools
TRD
Datafile TrID file identifier filetypes definitions package
TRIA
Data Greg Hood's ASCII Triangle
TRIB
Data Greg Hood's Binary Triangle
TRIF
Tiled Raster Interchange Format
TRK
Track (i.e. video sequence), used by many games
TRM
Terminal settings Windows 3.x
TRN
Translation support file Quattro - Clarion
TRS
Executable file Micrografx or password file
TRS
WiSo Mein Geld 2007
TRS
IBM Mainframe log file TRSMAIN
TRU
True Basic source file
TRW
Session-state settings Turbo Debugger for Windows
TRY
Typical Meteorological Year data (variant) TRNSYS
TS
MPEG Transport Stream Various media players / software
TS
Qt Linguist TS File Trolltech Qt Linguist
TSE
Data Light Map Maker ASCII Scene
TSK
Microsoft Multimedia Task Application Win95
TSL
Exported Schedule Tru-Scheduler part of Tru-i Suite
TSM
Turbo Assembler Manual TASM for OS/2
TST
Printer test file WordPerfect for Win
TSV
Tab Separated Values
TTF
TrueType Font file
TU?
Packed mail FTN software
TUD
The Ultimate Draw file The Ultimate Draw
TUT
Tutorial
TV
Table view settings Paradox
TVF
Table view settings dBASE
TVn
Overflow file above insert point in Doc n WordPerfect for Win
TXF
Tax eXchange Format
TXI
Support file TeX
Common name for ASCII text file
TXT
Tab-Delimited Text File Microsoft Excel
TXW
Yamaha TX-16W Wave File Convert (c) Villena
TY
TiVo movie TiVo
TYM
Time Stamp (PageMaker 4) PageMaker 4
TZ
Archive TAR - COMPRESS
TZB
Archive TAR - COMPRESS - BTOA
TZL
Tanzzle pattern file Tanzzle
TZX
Tanzzle image file Tanzzle

U

Ext. Description Used by
U3D
Model file format Ultimate 3D
U3D
Universal 3D Adobe Acrobat
U8
Sample
UB
Raw Unsigned Byte (8bit) data AWAVE
UC2
Archive UC II
UCN
New archive UC II
UCS
Unknownsoft Service Pack (mainly for Shadow OS 2009) Unknownsoft Computer Systems
UDF
Filter Aldus Photostyler
UDO
Data Moray User Defined Object
UDIWWW
bookmark data UdiWWW
UDW
Raw Unsigned DWord data AWAVE
UE2
Encrypted archive UC II
UFI
data UFO CaptureV2 settings -
UFO
graphic file Ulead Photo Impact
UHA
UHarc archive
UHS
Universal Hint System (binary file)
UI
Espire source code file Geoworks UI Compiler Geos
UI
Qt Designer's UI File Trolltech Qt Designer
UI
User interface Sprint
UIF
Long prompts for windows WordPerfect for Win
UIH
Espire header file Geoworks UI Compiler Geos
UL
ULAW audio file
ULD
Information about uploaded files Procomm Plus - Datastorm Technologies, Inc.
ULF
data MRF Mapping Tool Kit Universal List Format
ULT
Music UltraTracker
UMB
Backup file MemMaker
UNF
Universal NES Image Interchange File Format
UNI
Datafile Forecast Pro
UNI
Music format UNIMOD - MIKMOD
UNIF
Universal NES Image Interchange File Format
UNV
Text file containing finite elements nodal coordinates and more. See notes Originally used by SDRC for its I-deas software, a lot of simulation software use it today.
UNX
Text file containing UNIX specific info
UOML
UniqueObject Markup Language (UOML) is a XML-based markup language
UOP
Uniform Office Format presentation
UOS
Uniform Office Format spreadsheet
UOT
Uniform Office Format text
UPD
Update data dBASE
UPO
Compiled update data dBASE
URL
Internet Shortcut (URL) Windows Explorer
URT
Utah Raster Toolkit
USE
Log file
USP
Printer font with USASCII extended character set Adobe PageMaker
USR
User database file Procomm Plus - Turbo C++ tour
UST
UTAU vocal track UTAU
UT!
datafile uTorrent
UTZ
Mobile Phone Theme Sony Ericsson
UU
Encoded file (ASCII) UUENCODE/UUDECODE - Uuencoding
UUE
Encoded file (ASCII) UUENCODE/UUDECODE - Uuencoding
UW
Raw Unsigned Word 16bit data AWAVE
UWF
UltraTracker WaveSample UltraTracker

V

Ext. Description Used by
V
Consistency check support file ReaGeniX code generator
V
Main input file for an image Vivid 2.0
V
Coq source file
V
Verilog source file
V1, V2, ...
Split parts of a whole file JJSplit
V8
Covox 8bit file AWAVE
V10
Data Gouraud Shaded Vectors
V2D
Voucher design file Voucher management included in JFire (e.g. when printing a voucher)
VAI
multimedia PhotoDub document
VAL
Validity checks and referential integrity Paradox for Windows
VAL
Values list object file dBASE Application Generator
VALA
Sourcecode Vala
VAN
Animation VistaPro
VAP
Value Added Process NetWare 2.xx
VAP
Dialogic indexed adpcm voice file VBASE/40
VAR
Variable file IconAuthor
VB
Visual Basic .Net source file Visual Basic .NET
VBPROJ
Visual Basic .Net project file. Visual Basic .Net Express and Visual Studio 2003-2010 Project
File for projects containing Visual Basic code.
VBR
Visual Basic Custom Control file Visual Basic
VBS
VBScript script file VBScript
VBX
Visual Basic eXtension Visual Basic
VBZ
Visual Basic Setup Wizard Template Setup Wizard
VC6
Graphite - 2D and 3D drafting Ashlar-Vellum
VC
Include file with color definitions Vivid 2.0
VC
Spreadsheet VisiCalc
VCA
Visual Clip Art
VCD
VideoCD
VCD
VirtualDrive CD Image File
VCD
Value Change Dump (Verilog) temporal database file
VCD
VisualCADD Drawing File
VCR
VCR drivers for Arvid
VCW
Visual workbench information Microsoft Visual C++
VCX
Spreatsheet VisiCalc Advanced
VDA
Bitmap graphics
VDO
Story Board video image Story Board
VDR
Drawing ComputerEasy Draw
VEG
Vegas Project Sony Vegas
VEW
GroupWise for Windows Win
VEW
View file Clipper 5 - Lotus Approach
VFA
FontLab Database file FontLab
VFD
Virtual Floppy Disk Windows Virtual PC (among others)
VFM
Ventura Font Metrics file
VFM
Voting Form Voter
VFN
Voting Form for Customers Voter
VGA
VGA display driver
VGA
VGA display font
VGD
VGA display driver Generic CADD
VGM
Video Game Music audio format.
VGR
Graphics file Ventura Publisher
VHD
Virtual Hard Disk Windows Virtual PC (among others)
VI
LabVIEW Virtual Instrument LabVIEW
VI
Graphics file Jovian Logic VI
VI
Watcom editor script VI.EXE
VIC
see VICAR
VICAR
Graphics (Video Image Communication and Retrieval)
VID
Bitmap graphics (YUV12C M-Motion Frame Buffer)
VID
Graphics format Word&Deed
VID
MS-DOS Shell Monitor file MS-DOS 5
VID
Screen device driver Word
VIF
see VIFF
VIFF
Khoros Visualization Image File Format SDSC Image Tool
VIK
Graphics format (VIKING)
VIM
Vim script file Vim text editor
VINF
data ReMPEG log file - frames info
VIR
Virus or infected file
VIS
VIS graphics file
VLM
Vellum, Vellum 2D, Vellum Draft, Vellum 3D, DrawingBoard Ashlar-Vellum
VLM
Virtual Loadable Module Netware
VM
Virtual Memory file Geoworks
VMC
Virtual memory configuration DOS/4GW PM 32X DOS Extender
Virtual Disk file VMware
VMF
Font characteristics Ventura Publisher
VMG
Nokia message file format Text Message Editor (Nokia PC Suite)
VMS
Text file containing VMS specific info
VO
Include file with object definition Vivid 2.0
Video Object DVD-R, DVD-RW
VOC
Sound format (Creative Lab's Sound File) PlayVoc
VOF
Object folder VZ Programmer
VOP
Visual Orangator Project
VOP
Visual OTTHYMO Project
VOX
Dialogic adpcm file AWAVE, CoolEdit
VP
3DS Video posting 3D Studio
VPF
Vector Product Format
VPG
Graphics file VPGraphics
VPH
Virtual Pascal Help VP/OS2
VPI
Virtual Pascal Unit VP/OS2
Vector Quantized Animation The Legend of Kyrandia
VRM
Overlay file QuattroPro
VRM
Visual rexx source WATCOM VREXX
VRML
Virtual Reality Modeling Language NetScape
VRP
Project WATCOM VX?Rexx
VRS
Video Resource e.g. video device driver WordPerfect
VS
Vellum Solids Ashlar-Vellum
VS
Include file with surface definition Vivid 2.0
VSD
Diagram Shapeware Visio
VSD
Visio drawing Visio
VSM
Visual Simulation Model VisSim
VSP
Sprite SPX
VSQ
Vocal track data Vocaloid2
VSS
SmartShapes file Shapeware Visio
VSS
Visio Template Visio
VST
Truevision Vista graphics file
VST
Visio Template Visio
VSTO
Microsoft Office add-in file Microsoft Visual Studio
VUE
Animation 3D Studio
VUE
View dBASE IV - FoxPro
VW
Text file VolksWriter
VWR
File viewer file PC Tools
VWX
CAD File VectorWorks 2008
VXD
Windows 3.x virtual device driver Windows 3.x
VZT
Temporal database file GTKWave data file

W

Ext. Description Used by
W
Word chart file APPLAUSE
W01
Yamaha SY-series wave files AWAVE
W01
Yamaha TX16W wave file AWAVE
W30
Printer font AST TurboLaser - Ventura Publisher
W31
Startup file Windows 3.1
W3A
Warcraft III Abilities Export File Contained in a Warcraft III map
W3B
Warcraft III Destructables Export File Contained in a Warcraft III map
W3D
Warcraft III Doodads Export File Contained in a Warcraft III map
W3D
Westwood 3D object format. 3D models used in Renegade and Generals.
W3D
Shockwave 3D object format.
W3G
Warcraft III Replay File File for Warcraft III
W3H
Warcraft III Buffs Export File Contained in a Warcraft III map
W3M
Warcraft III Map File for Warcraft III: Reign of Chaos
W3N
Warcraft III Campaign File for Warcraft III: The Frozen Throne
W3O
Warcraft III Object Data Export File Contained in a Warcraft III map
W3P
Warcraft III Save Save File for Warcraft III
W3Q
Warcraft III Upgrades Export File Contained in a Warcraft III map
W3T
Warcraft III Item Export File Contained in a Warcraft III map
W3U
Warcraft III Unit Export File Contained in a Warcraft III map
W3V
Warcraft III Save Save File for Warcraft III
W3X
Warcraft III Expansion Map File for Warcraft III: The Frozen Throne
W3Z
Warcraft III Save Save File for Warcraft III
W40
Something for Windows95 (e.g. config.w40) Win95
W44
Temporary file for Sort or Index dBASE
W95
Something for Windows95 Win95
WAD
Where's All the Data? Doom - Doom2
WAD
Nintendo proprietary format for Wii channels, menus, etc. Nintendo Wii
WAG
Yard Contents File FYM
WAI
Warcraft III AI Data File Warcraft III AI Data File
Java Web Archive A Java file format used to package and deploy web applications.
WAS
ProComm Script File (source code) ProComm
Sound format (Microsoft Windows RIFF WAVE) Media Player
WAX
TVTonic WAX video packaging Wavexpress TVTonic
WAX
ProComm compiled script ProComm
WB1
Notebook Quattro Pro
WB2
Spreadsheet Quattro Pro
WBF
Microsoft Windows Batch File Catch
WBK
Document/workbook or Microsoft Word backup file WordPerfect for Win or Microsoft Word
WBT
Norton Desktop Norton Desktop
WBT
Wilsonware Batch file Winbatch
WCD
Condes Event Data file Condes
WCD
Macro token list WordPerfect for Win
WCH
WordPerfect Macro Facility WP
WCM
Data transmission file Microsoft Works
WCM
Macro WordPerfect for Win
WCP
Product information description WordPerfect for Win
WD
InfoSelect Data file
WDB
Database Microsoft Works
WDM
Admin tool connection definition War FTP
WE?
Packed mail FTN software
WEB
WEB source code file Web Easy Professional
WebOOGL
Web Object Oriented Graphics Library
WFB
Turtle Beach WaveFront Bank AWAVE
WFD
Turtle Beach WaveFront Drum AWAVE
WFM
Form object dBASE Form Designer
WFN
Font CorelDRAW
WFP
Turtle Beach WaveFront Prog. AWAVE
WFT
Web Family Tree GRAMPS
WFX
Data file Winfax
WG1
Worksheet Lotus 1-2-3/G
WG2
Worksheet Lotus 1-2-3 for OS/2
WID
Width table Ventura Publisher
Windows Imaging Format ImageX
WIN
Window file FoxPro - dBASE
WIREFRAME
Data EMSE mesh
WIX
Windows Installer XML WiX
WIZ
Page wizard Microsoft Publisher
WK1
Spreadsheet Lotus 1-2-3 version 2.x - Lotus Symphony 1.1+
WK3
Spreadsheet Lotus 1-2-3 version 3.x
WK4
Spreadsheet Lotus 1-2-3 version 3.4
WKB
Document WordPerfect for Win
WKE
Spreadsheet Lotus 1-2-3 educational version
WKF
VISI Working file Vero Software
WKI
Spreadsheet format Lotus 123 2x
WKQ
Spreadsheet Quattro
WKS
Spreadsheet Lotus 1-2-3 version 1A - Lotus Symphony 1.0, Microsoft Works
WKS
Workspace Xlisp
WKZ
Spreadsheet format Dos Navigator
WLK
Graphics Virtus Walkthrough
WLK
Walk Through for any game many
WMA
Windows Media Audio audio file
WMC
Backup of startup files by Windows MathCad autoexec.wmc MathCad
WMC
Macro file WordPerfect for Win
WMC
Text file WordMARC
WMDB
Windows Media Player database Windows Media Player
Windows MetaFile vector graphics
WMO
WoW Map Object Blizzard Entertainment games (World of Warcraft/Warcraft series)
WMP
Graphics (Windows Magic Icon Palette)
WMV
Windows Media Video video file
WN
Text NeXT WriteNow
WNF
Corel Draw Font File CorelDraw
WOA
Swap file Windows 3.x
WOC
Organization Windows OrgChart
WOW
Music (8 channels) Grave Mod Player
WP
Word Perfect Format WP
WP5
Document WordPerfect 5.x
WPD
Document WordPerfect 6.0 - PFS:WindowWorks
WPD
Windows printer driver (uninstallable) Windows
WPF
Fax WorldPort
WPF
Form WordPerfect
WPG
WordPerfect Graphics vector graphics DrawPerfect
WPJ
Watcom C/C++ IDE project IDE.EXE
WPK
Macros WordPerfect for Win
WPL
MediaRack Wave Playlist MediaRack
WPL
Windows Media Playlist, for Windows Media Player
WPM
Macros WordPerfect
WPS
Text document Microsoft Works
WQ!
Compressed spreadsheet Quattro Pro
WQ1
Spreadsheet Quattro Pro
WR1
Spreatsheet Lotus Symphony 1.1 - 1.2 - 2
WRD
Template Charisma
WRI
Write editor format Write - WinWord
WRK
Spreadsheet Lotus Symphony 1.0
WRL
VRML file
WRP
Archive Amiga WARP
WRS
Windows Resource e.g. might indicate error if word cannot open WordPerfect for Win
WS
APL Worksheet
WS
Text file WordStar 5.0-6.0
WS2
Text file WordStar 2000
WSD
Document WordStar
WSP
Workspace Fortran PowerStation
WSQ
Wavelet-packet Scalar Quantization Format
WSRC
X-wais source
WST
Text file WordStar
WTR
Working Timetable rules file Simsig
WTT
Working Timetable timings file Simsig
WTF
World of Warcraft Data File World of Warcraft
WTF
WinTaper Data
WWB
Button bar for document window WordPerfect for Win
WWF
WWF Document Format
WWK
Keyboard layout WordPerfect for Win
WXH
Program/Script File WaxHtml Web Programming Language
WXP
Document EXP for Windows

X

Ext. Description Used by
X
Archive X1.EXE
X
;
AVS X image file SDSC Image Tool
X
DirectX 3D object
X
LEX source code file
X
XBasic Source code file Xbasic
X3D
x3d and xdart Formats
XA
XA audio file used in SimCity 3000 by Maxis, also by Sony PlayStation
XAR
Xara graphics file Files created by Xara Photo & Graphic Designer (formerly Xara Xtreme and Xara Studio). Early versions used the extension 'ART'.
XBE
Xbox Executable Xbox
XBM
X11 Bitmap graphics file
Gimp image file The Gimp
XCK
Extended crack file (usually text)
XCL
Xtree for Windows Script file Xtree for Win
XDF
OS/2 extended disk format image XDFCOPY.EXE
XDM
Directory Manipulator for 32-bit Protected Mode Xenotech Research Labs
XE
Xenon - for Associative 3D Modeling Ashlar-Vellum
XEX
Xbox 360 Executable File
XFN
Printer font Xerox 4045 - Ventura Publisher
XFR
Ventura Publisher Bitmap Editor Font file
XFT
24 pin printer font ChiWriter
XI
Fast Tracker 2 instrument file AWAVE
XI
Fastracker 2.0 Instrument File Fastracker 2.0
XIF
Xerox Image Format Pagis Pro 2.0 and 3.0
XLA
Add-in macro sheet Microsoft Excel
XLA
XLib Archive xlibpas2.zip
XLB
Microsoft Excel Toolbar Microsoft Excel
XLC
Microsoft Excel Chart Microsoft Excel
XLD
Microsoft Excel Dialog Microsoft Excel
Extensible LADAR Format LadarSIM
XLK
Microsoft Excel Archive Microsoft Excel
XLL
Microsoft Excel Dynamic Link Library Microsoft Excel
XLM
Microsoft Excel Macro File Microsoft Excel
XLS
Microsoft Excel Spreadsheet Microsoft Excel
XLSB
Microsoft Excel 2007 Binary Workbook (BIFF12)(Spreadsheets) Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLSM
Microsoft Excel 2007 Macro-Enabled Workbook (Spreadsheets) Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLSX
Office Open XML Workbook (Spreadsheets) Microsoft Excel 2007 (see Microsoft Office 2007 file extensions)
XLT
Microsoft Excel Template Microsoft Excel
XLT
Translation table Lotus 1-2-3 - Symphony - Procomm Plus
XLV
Microsoft Excel Module Microsoft Excel
XLW
Microsoft Excel Workbook Microsoft Excel
XM
Fast Tracker 2 extended module AWAVE, Mod4Win, FastTracker, ImpulseTracker
XM
Music format FastTracker - Cubic Player
XMOD
Monarch Model Monarch Professional
XMI
Compressed eXtended MIdi music
eXtensible Markup Language file
XMF
eXtensible Music Format
XMPZ
XML Miradi Project Zipfile Miradi
XMV
video Xbox
XNF
Standard Network File form
Xnn
Secondary indexes Borland Paradox
XOF
RenderMorphics
XP
eXtended Pattern FastTracker 2.0
XPM
X11 Pixel Map graphics file
XPO
Microsoft Dynamics AX Export file
XPS
Open XML Paper Specification / OpenXPS open standard document format initially created by Microsoft and similar in concept to Adobe PDF files
XQT
Executable file Waffle
XQT
Macro sheet SuperCalc
XRF
Cross-reference file
XSF
data Microsoft InfoPath file
XML Sharable Playlist Format
XTB
External translation table LocoScript
XTP
XTreeGold overlay XTreeGold
XVF
Xyngo Video File Xyngo Video Board
XWD
X Window System window dump image graphics file SDSC Image Tool
XWK
Keyboard mapping Crosstalk
XWP
Session Crosstalk
XWP
Text file Xerox Writer
XX
Encoded file (ASCII) XXENCODE
XXE
Encoded file (ASCII) XXENCODE
XY
Text file XY Write
XY3
Text file XYWrite III
XYW
Text file XyWrite III
XYZ
Molecular coordinates XMol, RasMol

Y

Ext. Description Used by
Y
Archive (Amiga) Yabba
Y
YACC grammar file Yacc/Bison
YAL
Data custom/nature.yal Arts & Letters
YC
Archive YACC (YAC.EXE)
Ynn
Secondary index Borland Paradox
YMP
Yast Meta Package YAST2 (SUSE Linux Package Manager)
YST
Data YASRT Raytracer scene
YRD
Yard Tracks File FYM
YUV
Graphics format (YUV)
YY
Bison grammar file Bison
YZ
Archive YAC

Z

Ext. Description Used by
Z
Archive WinZipNT - COMPRESS - PACK
Z01-Z99
Split WinRAR Archive
Z2S
Zoo Tycoon 2 saved game Any game in the Zoo Tycoon 2 series.
Z3
Infocom game module
Z3D
Zmodeler-file Zmodeler 1 & 2
Z64
Nintendo 64 ROM Project64 Nintendo 64 emulator
Z80
Snapshot ZX Spectrum emulator by g.a.lunter
ZAD
ZFax digitized voice file ZFax
ZDG
Compressed ZiffNet text document Zview
ZED
BitTorrent Link Podmailing
ZER
Data file
ZIP
Archive PKZip - WinZip - Mac OS X
ZOO
Zoo Tycoon saved game Any game in the Zoo Tycoon (first) series.
ZZT
ZZT World Any world created using the ZZT editor.

References

  1. ^ WebSphere Message broker Help
  2. ^ karafun fileformats @ developer`s homepage
  3. ^ Zvereva, O. M. (2004). "Часть 2: ОПЕРАЦИОННАЯ СИСТЕМА WINDOWS 2000 PROFESSIONAL: КОНСОЛИ УПРАВЛЕНИЯ. ТИПОВЫЕ ЗАДАЧИ АДМИНИСТРИРОВАНИЯ [Part 2: The Windows 2000 Professional operating system: Control console; standard administration tasks]" (in Russian) (PDF). ОПЕРАЦИОННЫЕ СИСТЕМЫ. Yekaterinburg. p. 9. http://study.ustu.ru/view/aid/56%5C1/W2000-2.pdf. Retrieved 2010-03-18. "Несколько оснасток могут быть объединены администратором в инструмент (также называется документом), который сохраняется в файле с расширением .msc (Management Saved Console). [Translation: An administrator can gather a few frameworks into an instrument (also known as a document) stored in a file with the suffix .msc (Management Saved Console).]" 
  4. ^ Shields, Paul; Crump, Ralph; Weiss, Martin (2000). Windows 2000 server: system administration handbook. Global knowledge professional reference. Syngress. pp. 802. ISBN 9781928994091. http://books.google.com/books?lr=&id=sEZUk3ZM-sEC. Retrieved 2010-03-18. "A powerful feature of the MMC [...] enables administrators to create custom tools [...], simply snap in the desired tools, and then the console can be saved as a Management Saved Console (MSC) file [...]" 
  5. ^ "Article ID: 222330". Microsoft Support. Microsoft. 2004-08-13. http://support.microsoft.com/Default.aspx?kbid=222330. Retrieved 2010-02-10. "When sending HTML messages with an attached Microsoft Office 2000 document, the message is sent as an Outlook HTML message [...]. The Oledata.mso file contains necessary information to properly render the attachment in the message in its originating program." 
  6. ^ Fileformat.info
  7. ^ Puppy Linux. "Package management". http://puppylinux.com/development/package-management.htm. 
  8. ^ RFC 5334 Ogg Media types
  9. ^ http://filext.com/info/showthread.php?t=2625
  10. ^ Tru-i Suite, truknox.com
  11. ^ Tru-i Suite, truknox.com

External links