Hacking nintendo 64 on a gamecube with save functionality

[jespertje]

I've an n64 emulator on my wii (the one that requires you to inject an n64 game into the image file) which works with mario kart 64 and super mario 64, it also asks me if I want to make a game file on the memorycard, when I do so it really creates a save file but it doesn't save while it says it does. If I pull my memorycard out and then click on save in a spot in the game it says that I have to insert the memorycard to save, when I do so the screen that warns me that there is no memorycard detected just disappears and it won't save. Has anyone got it to work with save functionality? If yes can you explain me how you did it?