.vob files are the video. .bup files are backups of the .ifo files and contain the exact same information. .ifo files contain information about chapters, audio and subtitles. If you just want the A/V to watch and enjoy on your PC, then copy the .vob files to the directory of your choice and use a media player with a codec that can read .vob files. My personal favorite is VideoLAN's VLC media player, which is absolutely free and reads every video format I've come across.
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