Ok, my cousin was sent a video from a friend that he said has ifo and bup files but he can't play them I have no idea about media programs , but I know they guys on here are geniuses with computers .So my question is how can he play them ? Windows media player won't play them.. Is there a free program that will?
First off, you can go directly to:
http://www.videolan.org/ and download the latest VLC player from its home site. No need for the big two step.
A "DVD-Video" file is comprised o 3 file types ".ifo), (information), "bup", (backup to the .ifo), and ".vob" which is the video file. In other words, those files comprise the standard DVD-Video of a commercial DVD.
As to size of a VOB file, I believe they're limited to about 1GB. Thus, it requires several for a feature length film.
I really don't know, want to know, or care what you're doing with a folder of these files.
Not all players will access DVD-Video directly from a folder. As I recall the old "Nero Showtime" (Nero 6 and up, will).
The bottom line is, you should be able to burn the files/ folder you have, to a playable DVD with "ImgBurn".
https://www.techspot.com/downloads/3285-imgburn.html Then, there's no worry about what player software will, or won't, play from a folder, the point will be moot.