The following low bit rate WMA files may fail to play:

WMA 9.1 Quality 10 44kHz Stereo VBR
WMA 9.1 Lossless Quality 100 @ 96kHz 2channel 24bit VBR
WMA 9.1 Voice Quality 4kbps 8kHz mono
WMA 9.1 Voice Quality 20kbps 22kHz mono
WMA 9.1 Quality 98 44kHz Stereo
WMA 9.1 Lossless Quality 100 @ 44kHz 2channel 16 bitVBRnetwork.