Steam or not to Steam?

[Bubbles_Few]

Can someone definitively tell me if it's possible to patch my COD4 version into the steam-based version?

I can get XFire, but if everyone's on Steam anyway, then I could see both CSS and COD4 on my status screen. I know I can link a non-steam game into Steam, but I'm referring to the full steam version. Any advice is welcome.

peace bubs

[Mechhd_Few]

Just get X-Fire. It doesn't favor any game and it automatically detects installed games and no worries about patching to steam dominated program