hello, after having searched for 3 days, I finally found the real solution to the problem. for heroes 3. the game was made to be shot in 65536 colors (16 bit). right click on the desktop screen resolution advanced settings list all modes select the desired resolution in 65536 color (16 bit) mode. good games.

Use the HD mod and there will be no need for that.

tell me if i'm wrong but the hd mod is that for heroes 3 classic and not its axtantion?
if so, can you tell me how to do it , please

I'm not talking about HD remake (quite crappy, BTW) of original HoMM3, but about HD mod for (almost) all versions of HoMM3, including all oficial expansions and even unofficial ones, like WoG and HotA.

Here it is: https://sites.google.com/site/heroes3hd/eng/download

With this mod you can play in any resolution you want. It also fixes some bugs and adds some nice features that should be implemented in the original game (they are optional, so you can use them or not, if you don't like them).

okay ,great .
thanks for the information.

Je vous en prie. :)