Edit C:\Windows\PolicyDefinitions\WDI.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="wdi" namespace="Microsoft.Policies.WindowsDiagnostics" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <policies>
    <policy name="WdiDpsScenarioDataSizeLimitPolicy" class="Machine" displayName="$(string.WdiDpsScenarioDataSizeLimitPolicy)" explainText="$(string.WdiDpsScenarioDataSizeLimitPolicyExplain)" presentation="$(presentation.WdiDpsScenarioDataSizeLimitPolicy)" key="SOFTWARE\Policies\Microsoft\Windows\WDI" valueName="DataRetentionBySizeEnabled">
      <parentCategory ref="windows:Troubleshooting" />
      <supportedOn ref="windows:SUPPORTED_WindowsVista" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
      <elements>
        <decimal id="WdiDpsScenarioDataSizeLimitPolicyValue" valueName="DirSizeLimit" required="true" />
      </elements>
    </policy>
    <policy name="WdiDpsScenarioExecutionPolicy" class="Machine" displayName="$(string.WdiDpsScenarioExecutionPolicy)" explainText="$(string.WdiDpsScenarioExecutionPolicyExplain)" presentation="$(presentation.WdiDpsScenarioExecutionPolicy)" key="SOFTWARE\Policies\Microsoft\Windows\WDI" valueName="ScenarioExecutionEnabled">
      <parentCategory ref="windows:Troubleshooting" />
      <supportedOn ref="windows:SUPPORTED_WindowsVista" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
      <elements>
        <enum id="WdiDpsScenarioExecutionPolicyLevel" valueName="EnabledScenarioExecutionLevel" required="true">
          <item displayName="$(string.WdiDpsScenarioExecutionLevelTsOnly)">
            <value>
              <decimal value="1" />
            </value>
          </item>
          <item displayName="$(string.WdiDpsScenarioExecutionLevelResolution)">
            <value>
              <decimal value="2" />
            </value>
          </item>
        </enum>
      </elements>
    </policy>
  </policies>
</policyDefinitions>

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