I installed the m4a/mpeg4 codec for windows media player: http://www.free-codecs.com/download/3ivx.htm Along with the m4a tag importer for WMP (to allow WMP to see the tags of these new files): http://www.softpointer.com/WMPTagSupport.htm Unfortunatly there seems to be a bug with GameEx in this regard. After the file associations are set WMP plays the files flawlessly. GameEx, however, shows each of the m4a files 3 times in the list and refuses to play any of the listed files. Any advice?? If this was fixed im sure many users would be interested in adding this functionality...