@Monty31: It's a frodo issue, so Wii changes will not fix it.
@yakboy: http://wiibrew.org/wiki/Frodo contains instructions of how to add t64/d64 files. You browse from a list just like in other emulators! :-)
A note to everyone: If you have problems with the joystick not working, check the joystick button bindings - you can now also bind the direction keys on the wiimote.