4.2 Disk Operating System (DOS)
4.2.7 Editing system configuration files
SYSEDIT is a standard text editor used to edit system configuration files such as Config.sys and Autoexec.bat. Additionally, this utility can be used to edit the set of Windows initialization files generally referred to as INI files. INI files are basically text files that users can edit with a standard text editor utility such as SYSEDIT. INI files were created when Windows 3.X was added to the structure of DOS and have since been carried in later versions of Windows (Windows 9x) in the \Windows directory, for backward compatibility. Common examples are WIN.INI and SYSTEM.INI. Config.sys and Autoexec.bat are located at the root directory (C:\). To access these configuration files in Windows 95, for example, type sysedit at the Windows Start\Run dialog box. The figure shows the files brought up in several cascade Windows.

Alternatively, simply type EDIT CONFIG.SYS or EDIT AUTOEXEC.BAT at the DOS command prompt to bring up these files for editing in MS-DOS.