yup, what Craig said. the DVD-Audio format is less common than DVD-Video, so not all players will play them. I use discwelder to burn DVD-A discs, so I can play them on my Denon player. As far as playing DVD-Audio discs from your computer, yeah, you'll have to get some software, but I'm not sure what. but if you're just planning to play the discs from your computer, why not just burn data DVD's, and play the FLAC or WAV files directly?
Now I have a disc with several types files on the DVD, none of these are .wav files
.BUP, .IFO, .AOB files, all in the AUDIO_TS folder, right? that's completely normal for authored DVD-Audio discs.