Windows System File
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For other uses, see System file (disambiguation) .
.sys is a filename extension in Microsoft Windows and DOS-type operating system.
Most .sys files are real-mode device drivers.[1] Certain files using this extension are not, however: MSDOS.SYS and IO.SYS are core operating system files in MS-DOS and Windows 9x. The CONFIG.SYS file contains various configuration options (as well as specifying what device drivers will be loaded).[2] [3] .sys files can be found in the C:/Windows directory of Windows computers. It is found in the C:/Windows/winsxs subdirectory in later versions of Windows[which? ].[4]
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