Config.sys
Updated: 04/12/2021 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.
Config.sys today
Windows XP, Windows Vista, Windows 7, Windows 8, and Windows 10 do not have or use the config.sys file. This file has been replaced by the Windows registry.