The SUP file extension is used to refer to subtitle bitmap files that are supported by various DVD authoring programs. SUP files can be accessed and edited with the appropriate software. The SUP file extension is also used to signify Super Project Definition files that are used in the Super Project Analyzer application.The SUP extension is also used to refer to supplement database files in the Hallo Northern Sky (HNSKY) astronomy software program.
Raster Image Files. Subtitle bitmap image extracted from a DVD or Blu-ray movie; contains subtitle text graphics that are displayed during movie playback; can be used for adding DVD subtitles to movies with authoring programs such as IfoEdit.