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.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. These files may also be found in the C:\Windows\WinSxS folder, particularly in Windows Vista and its successors.[4] See also References el:.sys ko:.sys pt:SYS ru:.sys sv:SYS vi:.sys zh:.sys
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