Guide to enable High and Very High graphics

Search in windows for: %appdata%

This should bring you to the folder "Roaming" ( Users > "name" > AppData > Roaming ).

Click "The Creativ Assembly" > Napoleon > scripts.

Click the "preferences.script"

find gfx_video_memory 0

change to gfx_video_memory 536870912

Save preferences.script

Done.

Settings for High Graphics and Very High should now be unlocked in your game.