Windows 8 + Code Editor + Corona SDK

Hello All,

Perhaps this is something simple that I have just missed, or perhaps its not possible (which seems to be the case)

When I run something in the simulator, and choose file -> open in editor   the LUA file is always opened in notepad, despite the fact that .lua files are associated with the much more feature rich code editor application I have installed.

How can I change what Corona considers to be my code editor?