What kinds of music formats support Mercedes-Benz S-kle (W221)?

The Mercedes S-class (W221) can play music files in the following formats:

1. mp3. The flow rate must be between 32 and 320 kbps and the sampling rate is 8....40 kHz.
2. wma. The flow rate shall be between 5 and 384 kbps and the sampling rate is 8....40 kHz. The Commands system does not support .wma files that are encoded in DRM, have variable digital flow rates, are of type wma-pro or 5.1-Surround.