Interesting facts and tips.

What are you talking about?!)))) Everyone is playing fairly.

I found a way to transfer online saves for playing offline.
I tested it for single-player.
First, the interesting part:

1) Find the desired save file [some number.save] in the folder with online saves (Win7 - C:\Users\YOURUSER\AppData\Local\Ubisoft Game Launcher\savegame_storage\SOME_ID\44[br][/br]WinXP - C:\Documents and Settings\YOURUSER\Local Settings\Application Data\Ubisoft Game Launcher\savegame_storage\SOME_ID\44\)

2) Cut off the first 520 bytes in this file and save it with the .sav extension in the offline saves folder (C:\Users\YOURUSER\Documents\Might & Magic Heroes VI\Profile Name\Save).

3) Launch the game with the offline key, load our new save, and make sure everything works.

Now, the boring part:

How to find the right save?

The easiest way is to look at the file modification time. Another option is to search by save name. The save name is recorded inside the file in Unicode encoding. Accordingly, perform a search for files with the text [Our save name in the game] in Unicode. For example, you can do this in the Total Commander program. Or another option is to search for the mission description text, but already in UTF encoding.

How to remove the first 520 bytes?

Using a Hex editor, for example, WinHex: load the file into it, select the first 520 bytes, and press Del.

Using Total Commander:
File -> Split file
Part size 520
In the selected folder, we get a bunch of files
Then delete two files: the very first one with the extension 001 and another with the extension CRC
Then select the file with the extension 002
File -> Combine file
Rename the resulting file with the extension out to [Desired save name].sav

And in conclusion, I will tell you what the save file represents.
Conditionally, it can be divided into 3 parts:

1) Data with the save name, creation time (Unicode), mission description (UTF).
2) PNG screenshot for the save (256x144).
3) Other data.

As for the reverse conversion of an offline save to an online save, this still needs to be figured out, if it is even possible.