ggroy
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Make sure the path to the map does not contain Russian characters. I've encountered this issue before, and I finally figured it out. It shouldn't be like this - C/ProgramFiles/Игры/Heroes/maps. It should be like this - C/ProgramFiles/Games/Heroes/Maps. (This is just an example). In short, if you have a folder in Russian in the path to the game, the map will not work (and will not be displayed in the game either). Rename the folder from Russian to English.