I use Guitar Pro on a Mac. You just need to ctrl-click the gpx file and then "save as" the gpro filename.

Works every time

The Band name is the title of a song. Death Cab for Cutie. The song was written and performed by the Bonzo Dog Doo-Dah Band, A teen tragedy parody song. It was also played in Magical Mystery Tour, the Beatles film.

Apparently this is where Ben Gibbard got the name