Greetings felas,
Just installed AoW 2 and having few issues, first one the actual big green button "PLAY" doesnt launch the game, i have to launch from folder, it's not the big deal.
However when i launch from there the game start in windowed and i can't put it in fullscreen, if i do directly from the window the game size remain the same and i just get black borders or artefacts, and if it's through the GOG settings management i can change resolution inside the windowed game but still can't have fullscreen.
A little help would be appreciated.

That seems odd. Have you tried compatibility mode for both the main .exe and the setup program? I launch the game in windowed and then maximise the window, works fine.