File extension database

File Extension SYS

File extension SYS is widely used on MS-DOS and Windows platforms by SYStem files. Usually these files contain executable code for hardware device drivers (for example 1394bus.sys). SYS files run in the kernel-mode which is the highest possible privilege on Microsoft Windows systems. This means that errors in these files can cause great harm and data loss. If these files are infected by viruses, trojans or rootkits infection may be very hard to remove. We strongly recommend to install drivers only from trusted sources like official hardware manufacturer websites or digital media that came with the device.

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. 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.

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For more general information about SYS files, file extension sys and registry you can read one of the following articles:

  • file extension sysFolders, files and paths - Files are the entries or information stored on your computer. These are represented by binary coding and written on the tracks on a disk. Files are often represented by distinct icons, a normal practice done by Microsoft with their products including system files for their series of operating systems...
  • file extension sysWhat are file extensions? - File extensions are unnoticed yet are very crucial parts of the computer world. But many are still unaware of the basic foundation and principles behind the remarkable wonders of computers...

File extension SYS translations

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