If you're looking for the DirectX 8.1 Win10 fix...

[Oddible]

You just need to turn Compatibility Mode on. Open properties in Steam go to Local Files and Browse Local Files, right-click on GuildII.exe and open Properties-> Compatibility. Just run the troubleshooter, fixed mine except for the opening videos.

Steps here:
https://i.imgur.com/eza4r9q.png

[connect]

Thank you.
SplashScreen = 0 in config.ini