Thanks a lot for your answer, that's seems less confusing right now.

Hi, I have some troubles with the "Stadium Maker". Let me explain, in this screenshot https://image.noelshack.com/fichiers/2017/37/7/1505671643-2.png we can see that there is a second directory of map (I framed it in red), but I do not understand at all the utility, what does it come to do...