If you look in the co interface edits section, you'll find my thread that discusses how to edit it (which should be stickied but meh). The thread should tell you how to edit the file. The file can be found after extracting data.c3 in the created directory: data\map\MapObj\mine. If you want to delete the file for it, idk what that'll do to the client. If you want to completely remove it, you'd have to edit the dmap so it doesn't call the scene file that loads it. Good luck.
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