This lets you define or modify default LightBox settings.
General preferences:
ΓÇóUsing the ΓÇ£Choose ApplicationΓÇ¥ button, you can choose which application you want to launch with a standard ΓÇ£Open FileΓÇ¥ dialog.
Option double click on a thumbnail and LightBox will tell your chosen application to open the selected file. If the specified application is not currently running, LightBox will launch it for you. (e.g.: PhotoshopΓäó 2.0 or CanvasΓäó 3.0).