Edit C:\Windows\PolicyDefinitions\MSDT.admx

??<?xml version="1.0" encoding="utf-8"?>

<policyDefinitions xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" revision="1.0" schemaVersion="1.0" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
  <policyNamespaces>
    <target prefix="MSDT" namespace="Microsoft.Policies.MSDT" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="WdiScenarioCategory" displayName="$(string.WdiScenarioCategory)">
      <parentCategory ref="windows:Troubleshooting" />
    </category>
  </categories>
  <policies>
    <policy name="WdiScenarioExecutionPolicy" class="Machine" displayName="$(string.WdiScenarioExecutionPolicy)" explainText="$(string.WdiScenarioExecutionPolicyExplain)" key="SOFTWARE\Policies\Microsoft\Windows\WDI\{C295FBBA-FD47-46ac-8BEE-B1715EC634E5}">
      <parentCategory ref="WdiScenarioCategory" />
      <supportedOn ref="windows:SUPPORTED_WindowsVista" />
      <enabledList>
        <item key="SOFTWARE\Policies\Microsoft\Windows\WDI\{C295FBBA-FD47-46ac-8BEE-B1715EC634E5}" valueName="ScenarioExecutionEnabled">
          <value>
            <decimal value="1" />
          </value>
        </item>
        <item key="SOFTWARE\Policies\Microsoft\Windows\WDI\{C295FBBA-FD47-46ac-8BEE-B1715EC634E5}" valueName="EnabledScenarioExecutionLevel">
          <value>
            <decimal value="2" />
          </value>
        </item>
      </enabledList>
      <disabledList>
        <item key="SOFTWARE\Policies\Microsoft\Windows\WDI\{C295FBBA-FD47-46ac-8BEE-B1715EC634E5}" valueName="ScenarioExecutionEnabled">
          <value>
            <decimal value="0" />
          </value>
        </item>
      </disabledList>
    </policy>

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