According to the specs, it plays the following audio files
Audio - MP3, WAV/PCM/LPCM, WMA, AAC, FLAC, MKA, AIF/AIFF, OGG, Dolby Digital, DTS . I'm not sure if they are specifying only 2 channel or multichannel versions of this file format. However, you can set the audio/video output to PCM and let the AVR decode the files.