In your LaunchBox\AutoHotkey folder, right click and select New-> AutoHotkey Script. Open the created file with Notepad and paste the script into the file and save it. Right click on the file and select Compile Script. Name the newly created file to whatever you wish, I named mine Full Screen, for example. Place that file in your Yatagarasu Attack on Cataclysm game folder.
In LaunchBox, click edit on the game, choose YatagarasuLauncher.exe in the Launcher tab:
In the Additional Apps tab, click Add Application and browse to your compiled AHK script exe:
Ensure the following settings are selected: