Two other notable file extension SYS files are config.sys and MSDOS.SYS. These files are different from the ones that are described above because they contain configuration parameters in text form rather than executable code. In addition, these files were widely used in MS-DOS days along with autoexec.bat file to control the way system boots up. However these files are obsolete on modern Windows systems and are available for backward compatibility purposes only. SYS files stores system settings and has functions and variables used by the DOS and Windows operating systems.

Cannot open sys files in Windows?

Not being able to open sys files in Windows may be a result of registry errors or not having the appropriate application installed. It is strongly recommended that you scan your computer for registry errors (free).

SYS file extensions can be opened with windows operating systems and should not be opened manually instead they should be viewed with a text editor. From basic text editors to advanced word processing applications, there are many programs available to view SYS files. A text editor is a program for creating and changing text files. It can be used to write email, compose web pages, create computer programs and install little files that control them. Hence its ability to create and change computer data, its used to view SYS files.