WSR

Description
WSR is an audio file format used for storage and playback of music ripped from Bandai WonderSwan / WonderSwan Color games.

Information

 * WSR format specs (Japanese). Automated (Babelfish) English translation available here (search for WonderSwan / .wsr)
 * Wonder Swan Total Sound Driver looks like it might be useful in understanding the format

Software

 * Audio Overload (cross-platform, free)
 * Mednafen supports .wsr playback

Links

 * Example .wsr files