Does anyone know how I can convert the m4a audio files on my Mac into the wma files my PC-loving friends can use?

Ta!!

Is this of any use? (http://www.sheffieldforum.co.uk/search.php?s=&action=showresults&searchid=746851&sortby=lastpost&sortorder=descending)

http://forums.3ivx.com/cgi-bin/ikonboard/topic.cgi?forum=15&topic=91

All answered here: