Combining all games in mp4

[mlnboi]

In MP3 (i don't know if it was supposed to be an actual feature or not) you could open a replay in another title and make a ghost with a car from that different title so you could make someone race with canyon car against a valley car or stadium (turned out stadium is the best for almost every track), on every environment except stadium (counting in shootmania). But now that I try it with the new maniaplanet, it does not WORK.. So why exactly? .,.