I've never really paid any attention to it. I save out of BB and it save the file as MGU. I open in Real band and save it as SGU. I simply click on the SGU file and it opens in BB without any problem.

Next time I open BB/RB I will certainly check it out to see exactly what I'm doing.... it's been painless and it works so I never really bother to dig into the file types...

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.