I am not sure what should happened when I run explorer.exe shell:::{67718415-c450-4f3c-bf8a-b487642dc39b} but I used DOPUS as my explorer replacement and it opens my Desktop (I am running Windows XP SP 3).In Vista, it opened the add/remove windows features applet and then sat for ages trying to populate it. I gave up waiting, so I don't know if it would have got there eventually. I can confirm that it doesn't work right in XP -- I have a suspicion that this may only work correctly in at least Vista and possibly Win7.
Just to make sure we're on the same page, how did you try launching it in Vista? Run dialog, Command prompt, launchbar, etc...? Was any text , like 'Please wait' maybe, displayed over the empty list? Could you open the applet normally from the Control Panel and then try launching it via command again and let me know any differences you notice? Also do you get a UAC prompt in either case? You can also try launching it with the following command line:
Code
%windir%\System32\OptionalFeatures.exe





