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It should help – the standalone map editor from Black Phantom.
It is installed in a separate folder, works independently of the game, supports SoD and WoG maps, and has a number of advantages.
Download link:
Version 2.1, which does not require installation (7-Zip archive, 13.93 Mb)
http://narod.ru/disk/20940400001/MapEd_BlPh_2_1_Rus_WO_Inst.7z.html
Thread on the WoG forum:
http://wforum.heroes35.net/showthread.php?tid=1517&page=1
