SQX

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SQX
File extension:	`.sqx`
Developed by:	Sven Ritter
Type of format:	Data compression

The SQX-format is an open and free archive format. It can be used in one's own applications free of charge (license and royalty free). The homepage provides an SDK, with source and compiled DLLs which are likewise unemcumbered by license costs.

The SQX archiver is a high performance file archiver. It was developed because the specifications for most other archivers are not fully available to third-parties.

[edit] The main advantages of SQX format are

Main compressor is a LZH variant supporting LZ dictionaries from 32K up to 4096K
Ultra compression mode with dictionary up to 32768K
Several compressor extensions to handle multimedia data
High-speed audio (WAV) compressor
Special compressor stage for IA32 executables
Solid and non-solid archives support
Strong 128/256-bit AES encryption (Rijndael) for file data
Independent encryption of archive directories
Internal and external data recovery records
Full support for 64-bit file systems (the size of archives and archive volumes is limited only by the OS)
Support for digitally signed archives (envelope up to 512 bit, encrypted with 2 * 1024 bit)
SFX modules for DOS (32-bit PMode), Win32 and x64. All SFX modules support multi-volume archives
Archive and file comments