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Hello Discratefancy seeing you 'round these parts...
I don't think Far Cry 2 is supported. Many games such as Empire: Total War can be bought retail and CD keys can be entered into Steam for Steam features to be added (SteamWorks). I don't think Far Cry 2 supports this feature, try putting the key into 'register a produce I own' and see if it works. It may do, but I'm not aware of support for this currently.
Your other option is to 'add a non-steam game' which is on your 'my games' list, in the bottom left corner. Doing this, allows you to add the executable and play games while using the community overlay in game (so you can use the Steam browser / friends / group chat etc.) and works just like normal Steam games.
Although the game isn't really running through Steam, it allows you to keep a hold of the features from Steam community which are really useful.
Your other option is to 'add a non-steam game' which is on your 'my games' list, in the bottom left corner. Doing this, allows you to add the executable and play games while using the community overlay in game (so you can use the Steam browser / friends / group chat etc.) and works just like normal Steam games.