hmmz you need .ogg file extensions, if you have mp3 music files then you prolly need to find an mp3 --> ogg converter, dunno where to find one though. Well if you do get those files then put them in your UT2k3 music folder and then you can play them
yep that works. to anyone else wanting to do this just download that convertor open it pick all the songs u want make them ogg. copy them all go to ur ut2003 file then music and paste them in there. Once u do this your set. When ur in game go to setting player then playlist and they will be there.
...or just rip straight to ogg in the first place. It's an open-source format, unlike mp3, so no-one is ever going to start suing you for using them. The sound quality is generally higher with ogg as well, although the encoding process tends to take a touch longer. I'd be 100% using oggs if it wasn't for my shonky proprietry Creative Zen portable.