I am bumping up this thread, not sure if anything was done about it in the meantime.
CD music playback is broken since Windows Vista:
Not only do people have trouble getting the music to play, but once it does you have no control of the music volume, changing the music volume in the settings changes other sounds as well. I experienced that in several games now. And it gets worse than that, I am currently playing a game on Windows XP, because the game changes CD music volume during gameplay, so on my new Windows 7 computer when the CD music goes silent all other sounds go silent, it is completely broken game now, because of the changes in Windows audio mixer.
Just like there is a note now about broken DRM, there should be a note for games using Red Book CD Audio and we need some flag/marker in audio/middleware section for it.