Ment
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Actually, that's not entirely correct. Other editors do exist, and in this case, WinRAR, for example, will be useful. You can open the map file with an archiver; inside, you'll find a file called map.xdb (although there's another one with a similar name, which might be needed, I don't remember). You need to open it with Notepad, find the word "team" within the file, and edit the tags that follow it.