Ok, thanks for the savestate , unfortunatly , I still can't see anything. There must be something wrong in my settings of the emulator but I don't see what (and I'm not very familiar with Project64)
On the other hand, I've managed to go further in Rogue Squadron under Mupen64. The trick was to load a savestate to skip the first screen, because Mupen hangs on this. For that I had to do a pj64 savestate loader in mupen. It works well, so now I get the intro, I enter the menu, and then when I want to start a game , I can go up to the point of the starwar 3D text scroller , but unfortunatly at this point mupen doesn't recognize any input from the controller anymore. The game isn't crashed, it's just I can't go beyond that point since the "start" button is ignored.
That's an annoying very rare bug of mupen64, sometimes the controller inputs don't work anymore (the only other game where I noticed that is Donkey Kong 64, I suspect it's the same bug)