File Extension SYS

  • Full name
    System Format
  • Developer
  • Popularity
Have you encountered a problem with a SYS file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a SYS file here. In the further part of this page we have added a list of programs that should open your SYS file. It is enough you choose a proper application for your operating system, download and install it.


Sys identifies important files for the MS-DOS and Windows operating systems. These files may contain settings and variables depending on their nature, but also provide essential functions (system configuration files). SYS files are mainly used for device drivers (system device drivers).

Under MS-DOS and Windows 95, files like io.sys, msdos.sys, and config.sys were very important, but are no longer relevant. SYS files belong to the driver model of Windows and are often also part of drivers from other manufacturers. In addition to the usual system folders such as Windows / system32 and Windows / winsxs (as of Vista), these can also be located in the program or manufacturer-specific folders.

Generally you can not just install SYS files. Either they are copied via a driver installer to the right place or you need the matching inf files, which can be installed via context menu (right-click). In both cases, but still some other files are included.

Programs which can open a SYS file

How to open a SYS file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the SYS file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a SYS file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support SYS files. At this point we are looking for disk space where the application was installed in and we can link it with a SYS file. Since then, our operating system will use the selected program to support all SYS files.

Other issues

Despite the described problem with SYS there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the SYS file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the SYS file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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