I need help with modifying the .Exe file to support the new dual-screen resolution.

To be honest... I'm afraid to break things))) because I don't know how to fix them =(

Actually, there's no need to break anything in the literal sense. You just need to feed the game engine with more data than the programmers defined for a specific register (in types.xml, you need to fill in IDs for buildings = 255 or 256, just to be sure the game crashes... I'll let you in on a secret: this method was used to determine the register for the maximum number of creatures), i.e., in other words, you need to overflow the buffer... it's like a container of unknown volume into which you pour liquid... the amount of liquid is known... as soon as the liquid spills over the edge of the container, we'll know the maximum volume of the container!

By the way, are you experimenting with the standard .exe file or with some other one?!