So I typed into google (Other search engine are available) "Jimmy Hoffa Enimga Rising Tide multiplayer" and know I feel like an idiot

but
www.tidesofwar.net has some stuff on mutiplayer but then again the forum is locked with a password which in my non-extra ordinary life will never get

, If I found out the source code or/and engine the game uses I might be able to make mods for the game.