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

I know. I also have Avast. It really annoyed me. I had to add the game path and the project path to Avast's exceptions. The new maegapack_ru.dll from MegaPack_Rus 1.4 shouldn't be blocked by Avast. ... Maybe I'll try changing/swapping something in patcher_x86.dll.