When I try to open it (I have Maya 6.5), I get this error:
Maya binary file parse error: : (12) bad root block
Added 25 minutes later
But the patch you made for the tutorial works perfectly in Maya.
Well, that's correct, and that's how it should be!

I'll quote my family motto, which in Russian sounds like this: "Poor planning leads to failure!"

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1