It's a DVD .. so he should have copied both AUDIO & VIDEO_TS folders across .. into another folder by movie name.
There is nothing kept in AUDIO_TS. Inside VIDEO_TS are ifo, bup, VOB files to make up the DVD.
Open Video_TS.ifo with any Dirsct Show player (like WMP)
If it plays .. great.
If no play .. you need MPEG2 and ac3 audio codecs .. or VLC player .. or Classic Media Player. If you don't want to install another player ..
replay, and I'll post the links for the codecs. This is best way as does not clutter PC with un-necessary software.
Al.