When I see games where the minimum OS requirement is Windows 7, I always wonder if it's safe or if the game developers haven't tested the game on older versions of Windows. Is it proven that Konung 3: Ties of the Dynasty does not work with Windows XP?

Where does it say that minimum OS requirement is Windows 7? Because here on GOG store, it says

System: Windows XP / Vista / 7 / 8 / 10

edit: I see now, it only says XP / Vista on Konung 1 & 2 and not on Konung 3.

According to PCGamingWiki, Konung 3 also has Windows XP as a minimum requirement, so it should work just fine.