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

Hmm, and how do I attach it to the Game Ranger now? Previously, the installer automatically created an HD executable for each version of Heroes3.exe, and you could simply rename the correct one and use it with Game Ranger. But now there's only one launcher, and you have to launch it with parameters... goodbye, Game Ranger.