MP3, Flac, WAV, Ogg, AAC it's irrelevant. I dont want to harp on this and quite frankly, deep down inside I could care less what application people use. I just want users to understand that when they whole heartedly support or promote one application over another they also inadvertently subscribe to and by extension help promote an entire attitude towards copyright and fair use. Go ahead and try and play Apple Lossless or AAC on a RIO.