AXN10/MXN10
Issues with USB Media playback
Try this solution
Check that AXN/MXN can play back the file type you are trying to access
WMA, AAC, MP3, Vorbis, FLAC and WAV can currently be played. The AXN/MXN does not support ALAC, WMA Pro, WMA lossless, RAW, AU or other file types not mentioned.