Merranvo, I think that Disturbing was possibly implying that "I replaced my video card" didn't know that .wma and .mp3 were unsupported.
Naturally, though, you are right.
This may seem like an odd question, "I replaced my video card", but did you make sure you were
inside the soundzone? May sound a bit obvious, but I know people who've made mistakes like that. If you want the music played globally, then go to the Build Game dialog, to Level Settings, and then Global Settings. In there, change the music field to your music (making sure that you change another thing there too, because it doesn't save your last change).
Evil has a new name. Demo out now!