IFSHLP.SYS

From Wikipedia, the free encyclopedia

IFSHLP.SYS (Installable File System Helper) is an MS-DOS device driver included with Microsoft Windows. It enables Windows to make direct file system calls bypassing MS-DOS methods and use native 32-bit file access for both local and network devices. IFSHLP first shipped with Windows for Workgroups 3.11 and was also used in Windows 9x.[1]

The purpose of the IFS Helper is to ensure that no 3rd-party drivers intercept INT 21h calls; to achieve this, the IFSHLP.SYS is insured to be the first in the driver chain that intercepts DOS file access. If no other real-mode drivers are installed, IFSHLP will report that to the IFS Manager (IFSMGR.VXD in Windows 9x) and 32-bit file access will be enabled.

Inside the Windows 95 file system (ISBN 9781565922006) explores the Windows 95 device driver kit and covers IFSHLP.SYS.[2]

See also

References

  1. ↑ Peter H. S. Madsen. "Guide to CONFIG.SYS & AUTOEXEC.BAT". 
  2. ↑ Google Books search results for IFSHLP. Retrieved 2011-04-13. 


This article is issued from Wikipedia. The text is available under the Creative Commons Attribution/Share Alike; additional terms may apply for the media files.