Hey guys, as many of you are aware, there was a multiplayer co-op mod that was made for Halo 2 back in the day. Well, I made a tutorial on how to enable it for Halo 2 Vista and those of you who play the PC version may be happy with it. Please note I have no association with the mod whatsoever and merely made a tutorial on how to use it. All credit goes to the creators. Anyways, here it is, hope you enjoy.
Pretty cool. I know some people who want to play this game in co-op although I wouldn’t use this myself.
Yeah 
it’s not perfect, but it’s a start. Just thought i’d throw that out there for anyone interested