I guess this question has already been asked before but it's hard to find it via GOG forums' not-so-perfect engine.

I got an additional PC specially for GOG-gaming. It's dual systemed (Win7/XP) and it has no Internet connection.
Recently I installed AoW3 just to check could I bear it a little longer than last time I tried to play it, about a year ago.
I have a Triumph account but I don't remember my password of course and I have no Net connection at all, so I have to launch it as Guest. But some settings are turned off, I can only play in 1024*768, I can't turn some graphics options on.
Is it because of Guest launching or not?

It's not because of guest launching. I've played the game for years in that mode, including without internet connection.

Resolution can only be changed in fullscreen mode. Windowed and Borderless have a fixed resolution. Not sure why.

Thanks a lot for your reply. I guess I have Borderless thing checked on.