Play the Single-Player Story with the HaZardModding Coop Mod Co-Operatively. Up to 8 players supported via LAN or Internet. 3 different Classes with specific abilities, to support the Team.
This small Tool allows you to switch between the patched(1.1)and un-patched(1.01) version of ST:EF2. So you can join both versions of the game each time, with just one single installation.
This works perfect!
I'm using it for a quiet long time now.