Home : File Types : SYS File

.SYS File Extension

2 file types use the .sys file extension.

File Type 1Windows System File

4.1 (792 Votes)
CategorySystem Files
FormatText and Binary

What is an SYS file?

A SYS file is a system file used by Microsoft DOS and Windows operating systems. It contains system settings and variables, as well as functions that are used to run the operating system. SYS files are commonly used to store device drivers and other core Windows functions.

More Information

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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Programs that open SYS files

Updated 11/23/2020

File Type 2Motorola Driver File

3.9 (199 Votes)
CategorySystem Files

.SYS File Association 2

Device driver used by Motorola cell phones; allows the phone to communicate with computer and transfer files to and from the device; typically installed with the software installation CD included with the cell phone.

More Information

Example Motorola driver files include the "m56pci.sys" device controller and the "p2k.sys" file, which enables the P2Kman program to upload and download files from Motorola Vxxx cell phones.

Programs that open SYS files

Used by the operating system
Updated 4/6/2007

About SYS Files

Our goal is to help you understand what a file with a *.sys suffix is and how to open it.

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