I can't find the aircaft directory folder?

Hi there my name is Hamish and i recently became a pro member. I have downloaded the F8A Sabre and it says for it to work you hve to unzip the file and out it into the Aircraft Directory folder. Only problem is when i double click on the flight simulator x files document it does not show aircraft directory. Can you please help me with this

Many happy flying days
Hamish Kay