Heya, just found a bug to report.
While finishing my Metroid 3dn file, I accidentally made a save called 'Best Ending?' completely spacing that '?' is not an allowed symbol in file creation. This caused the emulator to glitch, freezing the entire game, along with the emulator. Curiously, the menus and such still worked, but they would not confirm any actions, or let me leave the 3dnes app. (I eventually had to go into task manager to force quit it.) Just thought that I would let you know!