1. For coop campaign mode you need download non steam FC version 1.1 link here: https://uloz.to/file/WwQE7neAecce/far-cry-1-cz-rar#!ZGR3ZwR1MJL4LGqwMzZ5LGZkAQt5MJAwMKSXpKN1E1OIAGxk ( becouse steam version is 1.4 and it dont works good with a mod )
2. Now you will need this program to LAN connect www.radmin-vpn.com - this works great. and LAN FIX for Far cry here too: http://nnz-css.clan.su/load/0-0-0-67-20 all Extract into main fc folder.
3. Now start Far Cry coop - host have to create a game and load.. partner start game and join. Thats all ;)
Ps: It works quite well, but the mod is not fully completed, some missions do not go whole, cutscenes do not load. Sometimes it also happens that the door is jammed and players can not get any further :D but its fun. Enjoy