Random maps are not displayed.

Good afternoon, I have a problem:
For some reason, maps created by the map generator are not displayed, whether they were created manually or using the map editor. I've checked the entire game folder, but nothing helps. I don't know what to do. I have the visibility of hidden files and folders enabled on my laptop. The funny thing is that both the map editor and the game can see these maps, but when I try to open them in the editor, it gives an error.
How can I fix this?
The path to the game folder is: C:\Program Files (x86)\Nival Interactive\Heroes of Might and Magic V - Tribes of the East