Hi everybody, I've recently downloaded DK2 from GOG on my surface pro 3 with windows 10, but the only way to play is attaching an old second monitor with a low resolution.

How can I play it with higher resolution?

Run the game once, set your graphics options other than resolution, then exit and open /HKEY_CURRENT_USER/Software/Bullfrog Productions Ltd/Dungeon Keeper II/Configuration/Video in regedit. Change the "Screen Width" and "Screen Height" keys to your desired horizontal and vertical resolution (change it from hex to decimal first).