NHF – new heroes for Heroes V 3.1.

I found this file, can you tell me how to use it to edit maps?

Added 6 minutes later
It's strange, my Maps folder is empty.

You move the maps from the Maps folder to the NHF MS folder, open the program, and edit them, then move the edited maps back to the Maps folder. If you don't have a folder with maps, I don't know how you're even running them.