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Installable File System
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===IFS in Windows 3.11 and 9x=== '''IFSHLP.SYS''' (the '''Installable File System''' Helper) is an [[MS-DOS]] device driver that was first released as part of Microsoft [[Windows for Workgroups]] 3.11. It enables native [[32-bit file access]] in [[Windows_3.0#Memory_modes|Windows 386 Enhanced Mode]] by bypassing the 16-bit DOS API and ensuring that no other [[real mode]] driver intercepts [[INT 21h]] calls. The protected mode counterpart of IFSHLP.SYS is [[IFSMGR.386]] in Windows 3.11 and [[IFSMGR.VXD]] in Windows 95 and Windows 98. <ref>{{cite web|url=http://madsenworld.dk/con_auto/index-uk.htm#14a|title=Guide to CONFIG.SYS & AUTOEXEC.BAT|author=Peter H. S. Madsen}}</ref><ref>{{cite book |url=https://books.google.com/books?dq=isbn%3A9781565922006&q=IFSHLP |title=Google Books search results for IFSHLP|access-date=2011-04-13}}</ref>
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