Paul,
The second method of getting GA3 midi into a Cubase track is simple and works with both 32 bit and 64 bits setups. I also found my imported files at the bottom of a many track project. So once you have the file on the desktop you simply import it into Cubase (File/Import/MIDI File…) and it will go to the bottom of your track list in an automated newly created track, per import. Or in other words every time you do an import it will create a new MIDI track and place it at the bottom of all your tracks in the project.
Hope that makes sense and helps. If not ask questions!
LB