blueprint

The blueprint files are read by the game so that it knows where the walls and such are. There isn't a way for us to look at them directly. 

Thank you. Is there any chance that EA could tell us how to read it? I really need direct access to the house structure.

6j85q6qua0lr​ Given that they haven't done so in 10 years, I think it's highly unlikely. You could join the Sims modder/creator server Creator Musings to see what others might might deduced about it.