Initialization file used with Microsoft Windows 3.x, Windows 95, and Windows 98 to initialize system settings for the computer, such as the fonts, keyboard, language and various other settings. The system.ini file is located in the C:\windows directory and its backup is the system.--- file. Users looking to view or edit the system.ini file can use the sysedit or msconfig utilities.
Users who are running Windows NT 4.0, 2000, XP, or later operating systems no longer have a system.ini. Instead of storing these settings in this file they are stored in the system registry. For backwards compatibility Windows 2000 and Windows XP may have a very basic system.ini.