Edit C:\Windows\PolicyDefinitions\FramePanes.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="framepanes" namespace="Microsoft.Policies.FramePanes" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="ExplorerFramePanePolicies" displayName="$(string.ExplorerFramePanePolicies)">
      <parentCategory ref="windows:WindowsExplorer" />
    </category>
  </categories>
  <policies>
    <policy name="NoPreviewPane" class="User" displayName="$(string.PreviewPane)" explainText="$(string.PreviewPane_help)" presentation="$(presentation.PreviewPane_DropDownList)"
    key="Software\Microsoft\Windows\CurrentVersion\Policies\Explorer">
      <parentCategory ref="ExplorerFramePanePolicies"  />
      <supportedOn ref="windows:SUPPORTED_WindowsVista" />
       <elements>
           <enum id="PreviewPane_Dropdownlist_Box" valueName="NoPreviewPane" required="true">
             <item displayName="$(string.PreviewPane_DropDownList_Hide)">
               <value>
                 <decimal value="1" />
               </value>
             </item>
             <item displayName="$(string.PreviewPane_DropDownList_Show)">
               <value>
                 <decimal value="2" />
               </value>
             </item>
           </enum>
         </elements>
    </policy>
    <policy name="NoReadingPane" class="User" displayName="$(string.NoReadingPane)" explainText="$(string.NoReadingPane_help)" key="Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" valueName="NoReadingPane">
      <parentCategory ref="ExplorerFramePanePolicies" />
      <supportedOn ref="windows:SUPPORTED_WindowsVista" />
    </policy>	
  </policies>
</policyDefinitions>

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