The case is a standard version of Heroes of Might and Magic IV, not the Equilibrium version.
Playing in non-full-screen mode is extremely inconvenient – there are glitches when viewing the map, and when trying to move it (clicking on the mini-map and dragging the mouse). There is also a problem with dragging the map if you try to move the corner of the global map with the mouse to scroll. This is extremely inconvenient for viewing.
In Heroes of Might and Magic III½ and V, there is an option to play in non-full-screen mode, which is very convenient. I would like to have that option here as well.