Exporting mixes



I’ve just mixed some tunes in Nero Soundtrax and exported as a single file [.wma] I can play it in nero showtime but not WMP11. It’s WMP11 that I use to listen to my music so thats where I’d like to play it. I tried exporting as .mp3 at first but couldn’t play it atall. Do I need to have to comvert to neros own format?