trololo_woman,
This is Windows 10 issue. You are running non admin user while the game is installed in admin restricted area (C: drive).
When you execute application as non admin user and that application wants to save a file, it is saved in a hidden profile folder linked to the folder you wanted to save it (<game folder>/Maps).
Either run the Utility map generator exe as admin or install the game away from the C: drive.
Tantalass thanks I will test and let you know if we find something.