Edit C:\Windows\PolicyDefinitions\MMC.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="mmc" namespace="Microsoft.Policies.ManagementConsole" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="MMC" displayName="$(string.MMC)">
      <parentCategory ref="windows:WindowsComponents" />
    </category>
    <category name="MMC_RESTRICT" displayName="$(string.MMC_RESTRICT)">
      <parentCategory ref="MMC" />
    </category>
    <category name="MMC_ExtensionSnapins" displayName="$(string.MMC_ExtensionSnapins)">
      <parentCategory ref="MMC_RESTRICT" />
    </category>
  </categories>
  <policies>
    <policy name="MMC_Restrict_Author" class="User" displayName="$(string.MMC_Restrict_Author)" explainText="$(string.MMC_restrict_Author_Explain)" key="Software\Policies\Microsoft\MMC" valueName="RestrictAuthorMode">
      <parentCategory ref="MMC" />
      <supportedOn ref="windows:SUPPORTED_Win2k" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="MMC_Restrict_To_Permitted_Snapins" class="User" displayName="$(string.MMC_Restrict_To_Permitted_Snapins)" explainText="$(string.MMC_restrict_To_Permitted_Snapins_Explain)" key="Software\Policies\Microsoft\MMC" valueName="RestrictToPermittedSnapins">
      <parentCategory ref="MMC" />
      <supportedOn ref="windows:SUPPORTED_Win2k" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="MMC_ExtendView" class="User" displayName="$(string.MMC_ExtendView)" explainText="$(string.MMC_Restrict_Explain)" key="Software\Policies\Microsoft\MMC\{B708457E-DB61-4C55-A92F-0D4B5E9B1224}" valueName="Restrict_Run">
      <parentCategory ref="MMC_ExtensionSnapins" />
      <supportedOn ref="windows:SUPPORTED_WindowsXP" />
      <enabledValue>
        <decimal value="0" />
      </enabledValue>
      <disabledValue>
        <decimal value="1" />
      </disabledValue>
    </policy>
    <policy name="MMC_ActiveXControl" class="User" displayName="$(string.MMC_ActiveXControl)" explainText="$(string.MMC_Restrict_Explain)" key="Software\Policies\Microsoft\MMC\{C96401CF-0E17-11D3-885B-00C04F72C717}" valueName="Restrict_Run">
      <parentCategory ref="MMC_RESTRICT" />
      <supportedOn ref="windows:SUPPORTED_WindowsXP" />
      <enabledValue>
        <decimal value="0" />
      </enabledValue>
      <disabledValue>
        <decimal value="1" />
      </disabledValue>
    </policy>
    <policy name="MMC_LinkToWeb" class="User" displayName="$(string.MMC_LinkToWeb)" explainText="$(string.MMC_Restrict_Explain)" key="Software\Policies\Microsoft\MMC\{C96401D1-0E17-11D3-885B-00C04F72C717}" valueName="Restrict_Run">
      <parentCategory ref="MMC_RESTRICT" />
      <supportedOn ref="windows:SUPPORTED_WindowsXP" />
      <enabledValue>
        <decimal value="0" />
      </enabledValue>
      <disabledValue>
        <decimal value="1" />
      </disabledValue>
    </policy>
  </policies>
</policyDefinitions>

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