Yxplayer lets you play all kind of files on an iPad, mkvs, avis, flvs all work BUT the iPad simply doesnt have processing power to play them smoothly or at least close to smooth. Sound is OK, so it can work well as music player of your wma files i guess, but until something is done about performance of the app, its not worth 5$. So just a warning/heads up for all, who want to play their files without converting to apple-friendly format.