I don’t know. But I question it would be a PG Music product because song files have proprietary extensions like .SGU and .MGU.

If that isn’t the point and all you want is a program that reads these MIDI files, many programs can do that, especially including Band-in-a-Box by PG Music.
BIAB 2022 Win Audiophile. Software: Studio One 5 Pro, Swam horns, Audition, Notion 7; Win 10 64 Pro. Hardware: custom i7 16 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & A5X monitors