Thats not exactly so. I am currently using the Symax theme, and there is a popup.rc and a popuptheme.rc

Popup.rc - has settings such as font height, weight, face, color, etc..... Nothing about any kind of *Popup

Popuptheme.rc - This has all the *Popups for the (SHIFT+LClick) on the desktop.

I still see nothing for the rightclick on the desktop though.