This takes a bit of explaining, but dedicated fans have been working for the last few years on decompiling Nintendo 64 games. This means that they take the output ROM data from their games, and using advanced techniques, they attempt the imperfect and artistic task of reverse engineering that back into human-readable code. Once in this form, the games can be recompiled again, this time for any system, not just the Nintendo 64.

This appears to have been what happened with The Legend of Zelda: Ocarina of Time a while back with the Ship of Harkinian project. Now, people associated with that project, have done the same for Star Fox 64. Their code has been released at the Starship GitHub page. Using this code and your own (LEGALLY SOURCED!) Star Fox 64 ROM, you can compile the game for your own PC, Mac, Steamdeck, or other system.

The project also supports modding if you know what you're doing. This kind of thing can open the door for full-speed, HD versions of Star Fox 64. Remember, this is NOT emulation! It will play better than on an Nintendo 64 with no slowdowns or incompatibilities due to issues with Nintendo 64 emulators. (Well, that's the theory. There are still many issues on the project remaining.)

Who knows how Nintendo feels about this, but it would be very difficult for them to argue this is illegal, as the project has no copyrighted assets. I think the future of game preservation will have a large wing for things like this: reconstructing the original game's intent by rediscovering the code that made it. What do you think?