Can't load ROMs from a path including characters that are not native to the operating system language. Steps to reproduce: Rename a confirmed working ROM file to something like あああ.nds, or copy it ...

You must put their ROM files into your gadget. MakeUseOf recommends using a cartridge dumper like Epilogue’s GB Operator to extract ROM files from game cartridges legally.

Once it opens, the top right will have a button that says 'Open ROM.' This is where players will be able to select the specific Pokemon game ROM to use. The File Explorer window will open.

Just drop both of the .exe files in the same directory, run the one that corresponds to the GUI program, and click the Open ROM menu item.

When starting the AppImage, I just get the dialog saying the ROM file is missing. But it's there, in the same directory. Named majora.rom. I've even checked it with https://2ship.equipment and it says ...