Does anybody?

[shadowgamer128]

Does anybody have any sort of Co-op mod for halo pc? i dont care if its a little or a lot buggy, i wanna try it out though.

[Tnnaas]

As far as I know, no, not on PC.

There is the one for Xbox though: System link / 4-Player Coop For Halo 1 [New Downloads!] (http://www.modacity.net/forums/showthread.php?22049-System-link-4-Player-Coop-For-Halo-1-New-Downloads!)
(It's obviously not what you want, but again, as far as I know it's the only cooperative single-player campaign mod available)