I'm not sure how that works. But if WMP can't play it then perhaps you're missing basic mp3 or m4a audio codecs. See http://www.free-codecs.com/download/...er_3_Codec.htm & get other audio codecs also.

But remember that WMP is a playlist player. So if you moved one of the songs from the original location when it was added to wmp, then it won't play. So you may need to re-add it back to wmp.