Here's another way to "skin the cat".
I just opened up a File Explorer in Windows,
selected "This PC" in the left-hand pane
and typed this in the Search box in the top RH corner: *.?g?

That will find all the BIAB .sgu, .mgu etc. files (plus a few others you can ignore).
Then I just copied and pasted them all to my new C:\bb\Songs folder.
Yes, I'll have a bunch of duplicates on my harddrive, but they're small files,
and this way I'll have them all in one place so the Song Picker can find them!!

LLOYD S