Open BUP File

BUP file extension is used by backup files on DVD Video disks. These files contain the same data as IFO files: subtitles, tracks, menus, chapters. DVD players fall back to reading data from these files in situations when IFO files are unreadable. Most common cause for this are scratches and other "tear and wear" of the optical media.

You cannot open BUP files by any program (except in binary format viewers) but disks containing these files can be played using DVD playback software such as Windows Media Center, PowerLink DVD Player etc. These files can also be created by DVD authoring software.