File extension SYS (.SYS) information

Windows cannot open SYS files?

If Windows is unable to open SYS files you may not have the appropriate program installed or may have a registry related error.

Format and name:

System file

Appropriate program for file extension SYS:

On the Windows 9.X and Dos operating systems the .SYS files are systems files, used for saving the various data, configurations and functions used by the operating system. Files such as the IO.SYS, CONFIG.SYS and the MSDOS.SYS contain essential information, such as device drivers. Although they can be opened and viewed with a text editor they should be modified with caution. Scan your system to prevent and identify association errors.

Recommendations for SYS file users:

Performance: To optimize memory and CPU usage for SYS files run a free performance scan.
Stability: Fix file extension SYS errors to make your system more stable.

Free system scan

Step 1:
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