Bighead, I don't think that playing .wma files would be more difficult than mp3's, wma could be played in pretty much every audio player I know (not quicktime though I guess), and WMP which is default for windows should guarantee that wma's will be possible to listen.
When uploading stuff, first of all it should be a single file. I would simply make a .rar archive with the wma's you want to upload. Then upload that archive.
P.S.: Fatso Jetson's Cruel & Delicious uploaded by Superdope has loads of great stuff, I approve.