I could use a help with a GoG game.
I've seen some trailers and screen shots of Port Royale 2 and I wanted to check it.
My problem is that I can't increase the games resolution from the in-game options or the separate configuration file.
It seems the game runs on a default 1024x768 or a 800x600 resolution.
How can I increase it to 1440x900 or at least 1280x720?

Sorry to say but,... no chance of changing to a higher resolution. At least none that I've heard of.

Official FAQ
Port Royale 2 is set at 1024x768. There is no option to change the screen resolution. If your monitor/graphics card does not support this resolution, you will not be able to play Port Royale 2.