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.
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.
- Windows 3.1x offers external links.
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