Additionally, regardless of how it appeared to be a .SGU extension, there were still most probably .WAV or other audio files or similar with those corresponding audio files in the same folder as the .SGU file. Otherwise I don't know how the tracks came to have the Artist names and orange track colors that you identified previously:

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I understand that the program adds those files because of the corresponding audio files it has created in the same folder (or something like that).

(PG Music should chip in and elaborate on how this actually works "under the hood".)


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