Notes about the MGU file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The MGU file type is primarily associated with 'Band-in-a-Box' by PG Music, Inc.. Band-in-a-Box is a music generation application. Just type in the chords to any song (like C or Fm7b5), choose a musical style from the hundreds available, and click the [Play] button. Band-in-a-Box automatically generates a full backing arrangement including RealDrums and RealTracks.