Homeworld 2 Classic Multiplayer Mod
This is a simple mod that simply readds the multiplayer menu to Homeworld 2 Classic. It does work using the Steam servers, but it seems password protection doesn’t.
The game balance is unaffected and it’s simply just one file changed to readd the menu option.
EDIT: I do seem to be getting some complaints that it doesn’t seem to work for some people, and yet it works for some others. I’m not sure why, and unfortunatly, there’s nothing I can really do. It does seem to be more luck than anything.
EDIT 2: Forwarding your ports might help, this has a list of ports that need to be forwarded: http://forums.relicnews.com/showthread.php?22497-Ports-Required-for-HW2-(1-1)