Edit C:\Windows\PolicyDefinitions\GroupPolicy-Server.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="grouppolicy2" namespace="Microsoft.Policies.GroupPolicy2" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
    <using prefix="server" namespace="Microsoft.Policies.Server" />
    <using prefix="grouppolicy" namespace="Microsoft.Policies.GroupPolicy" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="PolicyPolicies" displayName="$(string.PolicyPolicies)">
      <parentCategory ref="grouppolicy:PolicyPolicies" />
    </category>
  </categories>
  <policies>
    <policy name="ProcessTSUserLogonAsync" class="Machine" displayName="$(string.ProcessTSUserLogonAsync)" explainText="$(string.ProcessTSUserLogonAsync_Help)" key="Software\Policies\Microsoft\Windows\System" valueName="ProcessTSUserLogonAsync">
      <parentCategory ref="grouppolicy:PolicyPolicies" />
      <supportedOn ref="server:SUPPORTED_WindowsServer2008" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>    
    </policy>
  </policies>
</policyDefinitions>

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