The following steps will allow you to quit OpenMSX using the ESC key and to set its window to fullscreen:
Inside the' OpenMSX' application folder, create a text document (.txt) named 'script'.
Open it and add these 2 lines. Save:
set fullscreen on
bind ESCAPE "quit"
Or download this file and place it inside the 'Open MSX' application folder.http://www.mgalaxy.com/forum/index.php?action=downloads;sa=view;down=69