Sys extension stands for system files. These file extensions can be opened by Windows operating system.

1- Sys system files are essential for Windows operating system.  
Windows can not be worked without particular files such as io.sys, msdos.sys and config.sys. You should be careful about deleting or editing sys files.

2-Motorola cell phone system file: 
These are driver files that essential for Motorola cell phones. Sys files are used with "m56pci.sys" and "p2k.sys" names. You may transfer these files with the Cd which is founded with the mobile phone. 

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