See also:

Notes On Playing MP3 Files
The radio can play MP3 files; however, acceptable MP3 file recording media and formats are limited. When writing MP3 files, pay attention to the following restrictions. ...

Media Center 130 With Satellite Radio (Sales Code RES+RSC).
NOTE: The radio sales code is located on the lower right side of the radio faceplate. Media Center 130 (RES/RSC) ...

Supported MP3/WMA File Formats
The radio will recognize only files with the *.MP3/WMA extension as MP3/WMA files. Non-MP3/WMA files named with the *.MP3/WMA extension may cause playback problems. The radio is designed to reco ...