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Got it on Steam, but I am pretty sure I can mod it.
I modded the UI of my TF2 without issues. Think you just have to tell steam not to check the files of the game when you start up so that it doesn't try redownloading things that aren't there or are replaced by something else. I know people have Half-life 2 mods out the ass, and that is Valve's own game that requires Steam.
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