Lett0s
In the topic - Manual on adding a new model, animation, and creature to the HoMMV game, there is all the information for adding your own model to the game.
I saw this topic. If you open it and look at the very bottom, you will find information about how to port it for Heroes 5 and a link to ArchangelTools, which is what I did, following the manuals that come with the archive. The difference is that I don't need to assign bones, animations, and so on because I'm working with an in-game model and not trying to insert something new. To be even more precise, I don't even need to assign weights because I'm sculpting from what already exists, and judging by the check, the binding hasn't been affected, and everything moves as it should. I just need to figure out how to get this file back into the game. As I said, this part is simply omitted in the manual.