Hmmm....that doesn't look right.
First off, I don't see a single .MGU file in your first screen capture and secondly, that's an awfully specific folder (\Guitar, Electric, Held Ev 85) that doesn't sound like a very generic place for lots of random .MGU files (mostly jazz standards).

Thanks but I think I'll wait for at least one other reply to either confirm or point me in the right direction.