Updated: 04/26/2017 by Computer Hope

The config.sys is a system file used with MS-DOS and OS/2 that is loaded each time the computer first boots up. This file controls components connected to the computer such as memory and other hardware devices with early computers.

Config.sys today

Windows XP, Windows Vista, Windows 7, Windows 8, and Windows 10 do not have or use the config.sys file.

Autoexec.bat, Config, FCBS, Operating system terms