I usually play my video files of most formats in VLC.
A DVD file structure usually consists of a collection of BUP, INF and VOB.
Its the VOB files that carry the audio and video and can be played individually, directly on a pc by themselves.
The BUP and INF files tell the DVD player in which order to play the VOBs.
This is similar to image files that come as Bin and Cue files.
The data is in the Bin file but the Cue file tells it how to be burned in order to reconstruct the original CD or DVD.