Where do I put mod files for steam Doom 3 and ROE?

[Goro3D]

I recently got doom 3 best game ever!
Just wondering where do I put mod files for LMS coop cause a friend of mine and myself wanna do ROE coop.
I used to playing using my cd/dvd version of doom 3 but with the steam version now my doom 3 and ROE home can anyone please help me and tell me where these files go?
Thanks in advance!

[Major Havoc]

C:\Program Files (x86)\Steam\steamapps\common\Doom 3\base

[Goro3D]

Thanks, but now my friend can't join any ideas? He says he can't even see my server?

[Major Havoc]

I wouldn't know about that, you might try checking your firewall permissions.

[Goro3D]

Ya but still nothing very weird!

[Major Havoc]

My guess is that not all mods work for the Steam version of Doom 3. I just tried a simple mod called Doom3Cfg to adjust my graphics, but it doesn't work either.

[Goro3D]

I might just agree with you cause it really didn't work that well with the cd/dvd version either hmm maybe the BFG will make a difference?
Anyways wish when they made doom 3 coop was implemented but wondering why they never did that in the first place?
Come on ID add coop to a great game!