Made this script as the Yaba Sanshiro emulator does not launch in fullscreen mode correctly via comandline flags. So when using this script it will autopress Alt+Enter when launching Yaba Sanshiro to open in fullscreen.
Within LaunchBox go to Tools > Manage Emulators and double click on your Yaba Sanshiro emulator. Open the Running AutoHotKey Script Tab and paste in the contents of launchbox_autohotkeyscript.ahk into the window (as show in the figure below).
note for this to work the start in fullscreen option needs to be disabled. Located in Yaba Sanshiro - File > Settings > Video.