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Dracko81

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Pretty sure when you install it will guide you through the steam registration if you have not previously done one.

But yes the product key should add the game to your steam account.
 

LYNCHY

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what do you mean? you can get DLC off steam that will work with your game if that's what you are asking
 

ziamatt

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No, I was asking, If I buy a boxed version of the game, will the reg code work on steam?

If so, do any other Paradox games regestration codes work on steam?

Depends on the game. I think Steam has a list of games that can be registered if obtained outside of Steam. I suspect the expansions would work but you should definitely double check.