Remove Extra Registry Keys from GPO

One of my clients has Extra Registry Keys added to their "Default Domain Policy" GPO to enable Internet Explorer Compatibility View on all websites. Whoever added the template to the GPO is no longer with the company and I cannot find the ADM file in order to remove these Extra Registry Keys. See attached screen shots. How do I go about removing these Extra Registry Keys without creating an entire new Default Domain Policy GPO.
GPO-1.jpg
GPO-2.jpg
kpratolaAsked:
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Henrik JohanssonConnect With a Mentor Systems engineerCommented:
Getting issues with old policies is a reason for keeping the default GPOs clean and put custom settings into custom GPOs.

Create a custom ADM like below by using notepad and import it into the GPO
 Browse down to the custom setting and change it to be unconfigured.

CLASS MACHINE
CATEGORY CustomCategoryName
    EXPLAIN "Explanation for custom setting"
    POLICY "Custom policy setting name"
      KEYNAME "Software\Policies\Microsoft\Internet Explorer\BrowserEmulation
      VALUENAME AllSitesCompatibilityMode
      VALUE NUMERIC 1
    END POLICY
 END CATEGORY

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