Sorry for confusion. This should clear it up. Compliments from Matt:

There is a really good set of FAQ entries for PG Music products. Click on Support at the top of this page.

Here's your answer, from the FAQ:

http://www.pgmusic.com/techfaq28.htm#85

A lot of them are remnants from early versions. The two to know are .SGU and .MGU. When you enter only chords, it's .SGU. When you then add a melody, it gets saved as .MGU.


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