How to change sid of a disk using mfc, after cloning the disk.

In my application I have to add a Menu Item in the System Pop-up Menu, just like Winzip does. So that, I can manipulate my application from the menu, whenever I Right-clicked on any file. I couldn't find any way out about how to do this. Please guide me to write the code in MFC and also please tell, what are the necessary Registry Key entries for doing this during the installation of the application?:confused: Sudipta Mukherjee