File extension is used by BGI. The Borland Graphics Interface, also known as BGI, is a graphics library bundled with several Borland compilers for the DOS operating systems since 1987. BGI was also used to provide graphics for many other Borland products including the Quattro spreadsheet. The library loaded graphic drivers (*.bgi) and fonts (*.chr) from disk in order to provide device independent graphics support.
Preference file for BgInfo, a utility that keeps track of computer configuration information; stores custom settings chosen by the user within BgInfo. In order for BGInfo to use a BGI configuration file instead of the default configuration (which is stored in the registry), the name of the file must be specified in the command line. I.e. "BGInfo MyConfig.bgi". More information about BgInfo is available at Microsoft's TechNet BgInfo page. BgInfo was originally developed by Sysinternals, which was acquired by Microsoft in July, 2006.