Perhaps the content of the .mb files corresponds to what they should, but for exporting animations, there are some clips in the .ma files that are unclear what they are for... maybe it's worth asking this person about the .ma files?
Or, less likely, maybe he can explain how to export animations...
This person isn't a game developer... he worked there... in a completely different field, and this content was preserved with him purely by chance! So, it's something like that...

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