Why is it listed as a wii game? Nintendont is not a native port, or an official one, and in fact it is basically emulation. Also, it is impossible to emulate nintendont on pc, so something is wrong with all the emulated wii runs, as well as the wii runs. Barring emulation, which is never a platform, this game is only on arcade, specifically the triforce board.

There are still iso files for mkgp out there, all of my runs are run through my wii because arcades in Australia either dont have it or disabled the card reader in which karts are slower. (With mariocard it gives Power+ on karts which makes a massive difference with Time Trials)

those iso files are from the gd rom that the game was stored on