I just managed to disable automatic playing of DVDs on my XP laptop. Now
I can see the actual files. The larges ones are .VOB, so I know those
are the actual videos. There are also some .IFO files, clicking on them
brings up the menu. There are also some .BUP files. clicking on them
gets an error (cant recognise file type). So I dont know what they do.

Anyhow, I am wondering what the difference is between these .VOB video
files and a MP4 video? It does appear the .VOB files are larger, at
least for the length of video, but I dont have the same video in both
formats to know this for sure.

Anyhow, I'm just curious.

I do wonder if there is a means to convert them to MP4, but maybe that
is not wise. I can only assume that the .VOB is a better quality video,
just because the files are larger.