Edit C:\Windows\PolicyDefinitions\en-US\FramePanes.adml

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

<policyDefinitionResources 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">
  <displayName>enter display name here</displayName>
  <description>enter description here</description>
  <resources>
    <stringTable>
      <string id="ExplorerFramePanePolicies">Explorer Frame Pane</string>
      <string id="PreviewPane">Turn on or off details pane</string>
      <string id="PreviewPane_DropDownList_Show">Always show</string>
      <string id="PreviewPane_DropDownList_Hide">Always hide</string>
      <string id="PreviewPane_help">This policy setting shows or hides the Details Pane in File Explorer.

If you enable this policy setting and configure it to hide the pane, the Details Pane in File Explorer is hidden and cannot be turned on by the user.

If you enable this policy setting and configure it to show the pane, the Details Pane is always visible and cannot be hidden by the user. Note: This has a side effect of not being able to toggle to the Preview Pane since the two cannot be displayed at the same time.

If you disable, or do not configure this policy setting, the Details Pane is hidden by default and can be displayed by the user. This is the default policy setting.
</string>
      <string id="NoReadingPane">Turn off Preview Pane</string>
      <string id="NoReadingPane_help">Hides the Preview Pane in File Explorer.

If you enable this policy setting, the Preview Pane in File Explorer is hidden and cannot be turned on by the user.

If you disable, or do not configure this setting, the Preview Pane is hidden by default and can be displayed by the user.
</string>
    </stringTable>
    <presentationTable>
      <presentation id="PreviewPane_DropDownList">
        <dropdownList refId="PreviewPane_Dropdownlist_Box" defaultItem="0">Configure details pane</dropdownList>
      </presentation>
    </presentationTable>
  </resources>
</policyDefinitionResources>

Ms-Dos/Windows Unix Write backup

jsp File Browser version 1.2 by www.vonloesch.de