Steam Download - Where?

I downloaded the game via steam yet i cannot find where the game is stored on my HD in order to use any mods. Does anyone have any idea where the default download is placed. I have searched for it and all i can find the the NTW and not the actual game or file. I know this sounds like a real nood question but im really struggling.

Hi,

it is in the steam directory

drive x/steam/apps/commons/napoleon/data

You my friend are a legend. Many many thanks mate