.SUP File

File extension sup is is mainly related to a special subtitle format with 3D effect that is often used for 3D DVD or Blu-ray movies.

These subtitles are usually made from standard subtitle formats (SUB, SRT) using a specialized utility that makes the subtitles ready for 3D videos.

Files with sup extension can be nowadays commonly found as 3D subtitles for various 3D movies. Special variant of subtitles in a picture format.

How to open:

A lot of utilities nowadays can work with 3D subtitles, including .sup files.

How to convert:

You can find utilities that can prepare 3D subtitles from regular subtitle files (like .srt or .sub).