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By myself and with my own mind (almost – thanks to HEROESWORLD). Those who knew everything (Xaker, for example :smile31:) could have shared all the details.
But since everyone is silent, I will tell you.
Go into the data folder, then into data.pak/Maps. Look for something there. Next, I'll give an example using Contested Island (Maps/Multiplayer/A1M3/A1m3). I simply extracted it from there. Created a1m3_1.zip/Maps/Multiplayer/A1M3/A1M3/{all files here}. Renamed a1m3_1.zip to a1m3_1.h5m. It didn't work. Then I "cut out" one of the folders with the name A1M3, resulting in a1m3_1.zip/Maps/Multiplayer/A1M3/}{all files here}. Again, I changed the extension to h5m, put it in maps and voilà! Now I can edit Contested Island however I want. However, it will naturally be a separate map. And there are also some problems with the texts. More precisely, there are no texts (there is no problem:)). They need to be rewritten (or found somewhere in texts.pak and copied from there).
If something is wrong, correct me (I checked this purely empirically).
None of the maps launched using this method. But I was able to edit standard maps like this: I created a new map in the editor with the same settings as the original, then transferred all the files from the desired map, and everything worked. The map opens normally in the editor.