Extending Shared Printer context menu

Question

Hello, I need to extend the context menu of shared printer objects in windows explorer. This means, if I browse a printserver with \servername, I see all shared network printers. The context menu gives me the option to "open" and "connect" one of the printers. But I need to add another item to the list of options. I know how to extend the context menu of files, drives, file shares, etc. but until now, I haven't found the right entry point in the Registry (HKCR) for shared printer objects of printer servers in the network.
Can anybody give me any advice?