The modern "HD Mod" is more than just a simple resolution patch. Leading tools like the Emperor Resolution Customiser provide several critical enhancements:

Navigate to your game folder and make copies of Emperor.exe and the DATA folder.

Enter your desired width and height (e.g., 1920 x 1080).

Resolves the common bug where custom resolutions prevent the game from switching to windowed mode. How to Install the HD Mod

Start the game, go to Options > Display , and select the highest resolution (usually labeled 1024x768, though the patch will have changed the actual output). Method 2: Pre-compiled Widescreen Files