Xml import in musescore works fine,
the only downside is that the utility tracks (with midi info) are not available to be selected when save special to xml file.

See attached picture, the result is matching the biab file:

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Screenshot 2021-12-29 141157.png (161.16 KB, 58 downloads)

Artur