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DLL

Type: System Files

Acronym: Windows System File

File used by Microsoft DOS and Windows operating systems; contains system settings and variables, as well as functions that are used to run the operating system; commonly used to store device drivers and other core Windows functions.

Some examples of SYS files include the following:

  • IO.SYS: stores the default DOS device drivers and the DOS initialization program; used by DOS and Windows 9x.
  • MSDOS.SYS: contains the core operating system code for DOS, known as the DOS kernel.
  • CONFIG.SYS: contains the primary configuration information used by DOS.

System files are most commonly found within the Windows directory of a Windows installation. In particular, many SYS files are stored in the Windows\winsxs directory in later versions of Windows.

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