Mailto links in IE to go to Google Apps

I am trying to configure IE8 and Windows 7 so that when I click on Mailto links it opens up our Google Apps web interface, but can't get it figured out. When I go to Default Programs and Set Associations, I have Microsoft Outlook and Google Apps as options (Google Apps requires Chrome which I don't want). On one machine that I got running, I have a third option of Internet Shortcut Shell Extension DLL and it is working, but I don't have a clue how I got it there. Getting Firefox to link to the Google Apps Gmail is easy, but IE8 not so much. We have a registry fix for Windows XP and it worked great, but it doesn't work with IE8 and Windows 7. I have wasted nearly a day playing with this setting and haven't gotten anywhere. Ideas?

I ended up cloning the desktop image onto the laptop so that the working links now work on the laptop. I would still be interested to see if anyone knows of a way to get it to work easily. For now, my problem has been resolved.......at least until I need to figure out how to do it again.