win7, IE9, adobe reader XI. In order to stop ie from opening pdf's embedded in the browser, I need to disable the ie 'adobe pdf reader' add-on. I need to do this on a thousand machines so I can't do it manually. I've tried doing it via group policy using the below link, but it didn't work. The add-on said it was disabled, but pdf's still open embedded. Can anyone tell me how I can do this programatically, via group policy or via registry etc?