If LW can play it though, it sounds as though it's WMP issue. WMP is full of licencing & purchasing xtra codecs. That's why I hate wmp. There's lots & lots & lots of other mp3 players out there. Do a google for free mp3 players & you'll come up with heaps of responses. WinAmp & QCD player :
http://www.quinnware.com/ are supposed to be pretty good. Try GSpot.. it's free and it will tell you what you need to play a certain file.. just open the file in GSpot and it will tell you. http://www.headbands.com/gspot/