Current questions and answers regarding the map editor.

Could you explain it for those who are "particularly knowledgeable"? Here's the situation: I generated a random map (GSC) through the game, and it works fine (it launches from the game). Then, I open the map file in the map editor, just look at it, and don't change anything. When I save it, a warning pops up saying that "it won't work," and it saves with a lot of errors. In the Maps folder, this supposedly modified map is saved as a 1 KB file, and in the D:\GAMES\Heroes of Might and Magic V - Tribes of the East\Editor\H5MMods folder, an 811 KB folder appears with a bunch of miscellaneous files that make up the map. As a result of viewing it in the editor, the map disappears from the game. :(
Help a clueless person; I've already messed up a lot of maps by trial and error, and I don't understand what's wrong...
Where can I find that much-needed manual for the map editor, even if it's in the Buryat language – I just want to read it; otherwise, I can't figure it out by using my intuition. :(