Unfortunately, I've made a few tests importing those same music xml files into BIAB and the result hasn't been good. In fact, I've never been able to use Biab music xml import / export feature successfully.
Yes, that's the same experience that I have had.
Too bad. I was hoping for a shortcut to manual labor.
As mentioned elsewhere, support of a current version (4.0?)of music xml by PG music would be helpful.