Although I love PC games, I am a PC Idiot...I know some basics but...

So I downloaded the GOTM 3 file onto disk (did it at work!) and took it home to play on my PC (currently home internet is down...)

Where do I put the file and how do I play it? I tried putting it in the saved games file, no luck...tried renaming the file to get it to work in there...no luck.

Any help would be great!!!!