HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

[+] In 32-bit (MMX) mode, the game can run in fullscreen at any selected resolution (from 800x600 to 4000x4000), even if it is not supported by your system. And in windowed mode, you can freely change the window size.
This new feature is especially useful for those who complain that everything is too small in HD on monitors with high resolutions.
Also, thanks to this feature, the game is playable on monitors with resolutions less than 800x600.
At the same time, the image is stretched/compressed while maintaining proportions using bilinear interpolation (implemented with the help of MMX processor extensions).
In windowed mode, pressing the [F3] key sets the window size so that the image is displayed at a 1:1 scale, if the window fits within the desktop's working area. Otherwise, the maximum size is set, which is sufficient for the window to fit on the desktop. The window size is set in exactly the same way when exiting fullscreen mode by pressing [F4].

[+] The Heroes3HDSetup.exe utility now includes the ability to select a template for the map generator.
To add a template to the list, create a folder in HiRezData\Templates and place RMG.TXT in it. Accordingly, you can remove a template from the list.

[-] Bug with automatic map healing when viewing opponents' turns in a multiplayer game.
[-] Rendering bug (critical on some systems) when selecting some non-standard horizontal game resolutions.