Information about the .sys (sys) file type

Below is all the information we have available on file about the .sys (sys) file type.

Windows system file.
Windows swap file for Windows NT, Windows 2000, Windows XP and above.

Where this is available we would like to include file format information on .sys files, as well as information on how to view or open files of type .sys. If you know of any information which we have missed then please let us know.