Hello,
Just bought SimCity 3000 Unlimited, and in Preferences highest resolution I can set it is 1280x1024. I searched on Google, and found a way to make 16:9 resolutions available up to 2560x1440, but it is with HEX EDITOR altering game executable. Maybe there is easier way to make 16:9 resolutions available? Without editing the exe file? Maybe GOG version of the game has some configuration files which I can edit?

I have 4K UHD screen so 3840x2160 resolution would be sweet :) but I think the items on screen will be very tiny and hard to see, so 2560x1440 would be cool :)

Anyone had any experience with changing resolutions to 16:9 in SC3000?

Is there other way without hex editing? Or hex editing is the only possible way?

Worked very well! Thank you a lot! Game plays in 4K UHD (3840x2160) without any glitches. Did not had any instability, the game did not crash yet. Thanks!

I still can't run the game. As soon as I launch it, it crashes back to desktop.

Works great in 720p for me, so I will leave it at that.

Thanks for teh patch link! Not tried yet, but for others who will, apparently GOGie users don't need a no-CD patch to get it all working (as it's mentioned for teh Unlimited edition, in teh linky).

Sadly, patch says: SImcity 3000 not found :( !

You shouldn't run the patch. You have to click and drag SimCity 3000 Unlimited/Apps/SC3U.exe onto sc3k-patcher.exe. That is, as if sc3k-patcher.exe is a folder and you want to move SC3U.exe into it. The patcher sc3k-patcher.exe also doesn't have to be in the same folder as SC3U.exe. Just drag SC3U.exe directly onto sc3k-patcher.exe wherever you unzipped it, and make sure your desktop resolution is set to what you want the patcher to add to the game.

Thanks @Matewis, the patched worked! Unfortunately, the screen, while without black borders is off and I can only see the top left part of it. So, back to 800x600.

What resolution did you change it too though? If it's not divisible by 8 it might give you problems

Changed it to 1920X1080!