Edit C:\Windows\PolicyDefinitions\AppXRuntime.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="appxruntime" namespace="Microsoft.Policies.AppxRuntime" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="AppXRuntime" displayName="$(string.AppxRuntime)" explainText="$(string.AppxRuntime_Help)">
      <parentCategory ref="windows:WindowsComponents" />
    </category>
  </categories>
  <policies>
    <policy name="AppxRuntimeBlockFileElevation" class="Both" displayName="$(string.AppxRuntimeBlockFileElevation)" explainText="$(string.AppxRuntimeBlockFileElevationExplanation)" key="Software\Microsoft\Windows\CurrentVersion\Policies\Associations" valueName="BlockFileElevation">
      <parentCategory ref="AppXRuntime" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="AppxRuntimeBlockProtocolElevation" class="Both" displayName="$(string.AppxRuntimeBlockProtocolElevation)" explainText="$(string.AppxRuntimeBlockProtocolElevationExplanation)" key="Software\Microsoft\Windows\CurrentVersion\Policies\Associations" valueName="BlockProtocolElevation">
      <parentCategory ref="AppXRuntime" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="AppxRuntimeMicrosoftAccountsOptional" class="Both" displayName="$(string.AppxRuntimeMicrosoftAccountsOptional)" explainText="$(string.AppxRuntimeMicrosoftAccountsOptionalExplanation)" key="Software\Microsoft\Windows\CurrentVersion\Policies\System" valueName="MSAOptional">
      <parentCategory ref="AppXRuntime" />
      <supportedOn ref="windows:SUPPORTED_Windows_6_3" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="AppxRuntimeApplicationContentUriRules" class="Machine" displayName="$(string.AppxRuntimeApplicationContentUriRules)" explainText="$(string.AppxRuntimeApplicationContentUriRulesExplanation)" presentation="$(presentation.AppxRuntimeApplicationContentUriRules)" key="Software\Microsoft\Windows\CurrentVersion\Policies\Packages\Applications" valueName="EnableDynamicContentUriRules">
      <parentCategory ref="AppXRuntime" />
      <supportedOn ref="windows:SUPPORTED_Windows_6_3" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
      <elements>
         <list id="ListBox_ContentUriRules" key="Software\Microsoft\Windows\CurrentVersion\Policies\Packages\Applications\ContentUriRules" valuePrefix=""/>
       </elements>
    </policy>
  </policies>
</policyDefinitions>

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