A new unofficial 2.81f patch is out that’ll give Heroes of Might & Magic III a much higher resolution, which is especially useful for gamers with huge monitors.
The “HoMM3 High Resolution Project” is an add-on pack that changes game resolution to any from 800x600 to 4000x4000. It also adds new functionality and fixes some original bugs.
You can download it directly from Strategy Informer here.