Didn't test. I think it will....
Can you check it out as it doesn't work for me(requires 1.1 update).
Well, I tried some races online. This is what I got from some of the custom tracks:
- Rainbow Road N64: the game froze in a blank screen before the race starts.
- Icy Kalimari Desert: played normally, possibly because this one is most a texture reskin.
- Sandcastle Park: the race started normally, but after the first turn, I couldn't follow the old course (through the low screen), neither the new course. So I became stuck, and after trying sometimes, I fell out of the course. Then everytime Lakitu catched me to return to the course, he dropped me again on the pit, entering in a loop. Soon after I receive a communication error and was disconnected.