I deleted the project, I saving all files on folder “content”, but there is a map that can not be opened.
The engine tells me 5mb, but actually weighs 9GB.
Anyone have any idea?
Don’t erase your project! 
First you have to open your project and then you will be able to open your map, if you delete your project, the map won’t open. The map is assigned to your project.
It is not entirely correct, I have 5 maps, and I can open all, but I can’t open the map space4.
Any idea ?