Okay, if you and your friend try to play coop campaigns, and one of you have original sup com linked (to play the videos properly) and the other player doesn't, your games will desync. Further, your replays will desync.
Whatever code references those original supcom files needs to be removed. People who have supcom installed cannot play or watch the replays of people who don't and visa versa, t's ridiculous. Fix this desync please!