.sys is a filename extension in Microsoft Windows and MS-DOS operating system.

Uses for .sys Files

* In MS-DOS and DOS-based operating systems such as Windows 98, these files can be used as configuration files for the operating system. The MSDOS.SYS and CONFIG.SYS files contain various configuration options. [ [http://support.microsoft.com/kb/118579 Contents of the Windows Msdos.sys File] ] [ [http://www.dewassoc.com/support/msdos/config_sys.htm What is a CONFIG.SYS FILE?] ]
* .sys files are used as device drivers. [ [http://www.osronline.com/article.cfm?article=233 Exactly What Is A Driver?] ]


See also

*VxD "(virtual device driver)"

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