Files with sys file extension can be often found as various system files in DOS / Windows and other operating systems. They contain information needed to properly load and configure operating system. A corrupted or missing system file can cause the system to be unstable or unable to boot.

Detailed description

Software that open sys file

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SYS file extension - System file

What is sys file? How to open sys files?

File extension sys is traditionally associated with system files, which contain code needed to properly load and configure Windows and were also used in MS-DOS system.

The sys files can also be part of hardware drivers and contain various instruction for their flawless operation. But make sure to always install drivers from reliable sources.

If you are not certain about your .sys files, it's better to leave them alone and do not delete them.  A corrupted or missing system file can cause the system to be unstable, unable to boot or data loss.

Typically, files with sys file extension include config.sys, pagefile.sys, hiberfil.sys and other files located within the root or Windows directory.

Updated: November 9, 2023

The default software associated to open sys file:

Microsoft Windows icon

Microsoft Corporation logoMicrosoft Windows  Microsoft Windows software

Company or developer:
Microsoft Corporation

A family of operating systems developed by the Microsoft Corp. The first Windows was released in 1985 as a GUI add-on to MS-DOS. MS-DOS based Windows versions were developed to 2000, when was released the last version called Windows ME. Windows based on NT core started in 1993. Windows NT family are developed to these days, the latest version is called Microsoft Windows 11.

Related articles:

How to remove hiberfil.sys

How to move pagefile.sys

Help how to open:

System files are rarely meant to to be editted manually by the user. More often they are just automatically accessed by the operating system or some program.

How to convert:

These files are typically not meant to be converted to anything else.

List of recommended software applications associated to the .sys file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open sys file, edit sys file, convert sys file, view sys file, play sys file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with sys file - System file

Click on the software link(s) for more information. Suggested software applications use sys file type for internal purposes and/or also by different way than common edit or open sys file actions.

Microsoft Windows:


Microsoft MS-DOS:

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