If you use the decompress function on the wma files it will convert them to wav the Mac app will play, but you need to have hard drive space unless you already have the Audiophile version.
If not you will need to convert the wma to m4a and also all the wma demo files for RealTracks, Drums, Style demos etc... unless you set your default media player to one that will play the wma demos.
And if you convert wma to m4a you will need to make sure it converts mono to mono and stereo to stereo.