Do you have a couple of questions about mentoring?

Yeah... You're a real genius! No one has ever tried to present such a mess and hilarious nonsense to me before. Okay, I'll explain again.
The game accesses game archives through the executable file; all of them are located in the data folder. The game also searches for files in the UserMods and Mods folders. It always uses the final files with the latest modification date. And in the mods that you have in UserMods, there is absolutely the same folder structure as in data.pak, just not all of it. Yes, the author could have changed part of the system by creating new folders and writing new paths in the xdb file.

However, the music is handled separately from the date, only through the music folder. Therefore, simply dumping files into UserMods won't work. The game always calculates paths relative to the root folder – "Herpes of Might and Magic V," and the paths are specified only relative to its contents, that is, exactly as I wrote above. Mods for music can also change the xdb file with a reference to the ogg file, and then the ogg files may not be located as they are in the music folder. For example, for my stalker mod, I created a music_stalker folder in the directory and, in the advanced map editor, in the Music table, I rewrote the paths to the music.

So, it shouldn't be in the directory itself! xD All of this, of course, is located in data/data.pak. And you can find a guide using Google. "homm5 how to create your own hero site:heroesworld.ru".

The last part made me smile. No, dumping a thousand other h5u files into h5u and hoping that the game will understand our innocent intentions is u s e l e s s.