Disable Adobe Reader Add-on in IE Won't Work

Hi,
I’m having an issue where I can’t disable the Adobe PDF Reader add-on in IE through GPO.
What happens is the add-on says that it is disabled, but PDFs still open inside of IE.
If I don’t apply any policy, and manually disable it, it works fine (PDFs open in their own Adobe Reader application).
The policy I’ve applied is Windows Components/Internet Explorer/Security Features/Add-on Management/Add-on List.
I’ve entered {CA8A9780-280D-11CF-A24D-444553540000} for the Adobe Reader add-on, and gave it a value of 0.
I’ve also enabled Windows Components/Internet Explorer/Security Features/Add-on Management/All Processes, thinking that might help.
I’ve done this in both the Computer and User settings.
If anyone can tell help me with this I’d really appreciate it.
I’ve spent a lot of time on this, and I seem to be getting nowhere.
Thanks

I installed Adobe Reader XI, imported this ADMX, but it didn’t work.
Even with that option set, PDFs still opened in IE.
I read that part way through the releases of Adobe X and into XI, Adobe moved the option to display PDFs in the browser out of the Adobe options and into the browser itself.
I installed the Adobe Reader X Customization Tool, and set the option in there to not display in the browser.
I’ll use this custom installer to deploy it, and keep watching/testing to see if I can get it to work in a newer release later on.

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Disable Adobe Reader Add-on in IE Won't Work

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