Nah third party mods are like Fortress Forever or stuff like that. You need to d/l the game and add it to your steamapps folder for it to work, you also need HL2 if its a hl2 based game
awesome thank you. can you do that for games like cod4 or would that not work :x i just ask because i installed insurgency 2.1 yesterday on my 5 dig
COD4 you cant add to steam unless you but it through steam store. You can make a shortcut for it by clicking add non-steam game then like that.