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.SGU - songs without a melody.
.MGU - songs with a melody.
.MGX - songs with a multi-channel melody track (such as if you had imported a MIDI file with multiple instruments.)

.SG1, .SG2 ... .SGD, etc.

These are legacy file extensions, where the third character was used to indicate that the song used one of the basic built-in styles, like ZZJAZZ, ZZCOUNTRY ("U" stands for User).
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