RE: External Links Jonathan Metzger 16.Jan.12 12:43 PM a Web browser 1-2-3 9.8Windows 7
Assuming a test file of Test.123 located in the default directory, you can reference it by <<TEST>> whether it is open or not. You only need the extension if it is a WK4 file.
I couldn't find a way to change which extension is the default, so it's probably always safer to specify within the link.