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Open the archive with any archiver, for example, WinRAR. Go to Maps/Scenario/mission_code (e.g., A2C2M5). Inside, pay attention to 2 files: map.xdb and GroundTerrain.bin. In the editor, create an empty map, save it, and open it again with an archiver. Replace the map.xdb and GroundTerrain.bin files in the map with those from the mod. The newly created map will change to the desired one from the campaign. After completing all the changes, put the updated map.xdb and GroundTerrain.bin back into Maps/Scenario/mission_code of the mod.
Wonderful! Thank you very much for your help! It helped a lot; I tried many things, but only this worked! The only thing is that when replacing only these 2 files in a new map, editing them there, and then returning them to the map's folder from the mod, the map would break... The scripts wouldn't work, I don't know why. But I simply copied not only these 2 files but all the mission files, and that helped! Thank you very much again!