Edit C:\Windows\PolicyDefinitions\WinStoreUI.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="WindowsStore" namespace="Microsoft.Policies.WindowsStore" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="WindowsStore" displayName="$(string.WindowsStore)">
      <parentCategory ref="windows:WindowsComponents" />
    </category>
  </categories>
  <policies>
    <policy
        name="RemoveWindowsStore_1"
        class="User"
        displayName="$(string.RemoveWindowsStore)"
        explainText="$(string.RemoveWindowsStore_Help)"
        key="Software\Policies\Microsoft\WindowsStore"
        valueName="RemoveWindowsStore"
        >
      <parentCategory ref="WindowsStore" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy
        name="RemoveWindowsStore_2"
        class="Machine"
        displayName="$(string.RemoveWindowsStore)"
        explainText="$(string.RemoveWindowsStore_Help)"
        key="Software\Policies\Microsoft\WindowsStore"
        valueName="RemoveWindowsStore"
        >
      <parentCategory ref="WindowsStore" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy
        name="DisableAutoInstall"
        class="Machine"
        displayName="$(string.DisableAutoInstall)"
        explainText="$(string.DisableAutoInstall_Help)"
        key="Software\Policies\Microsoft\WindowsStore"
        valueName="AutoDownload"
        >
      <parentCategory ref="WindowsStore" />
      <supportedOn ref="windows:SUPPORTED_Windows_6_3" />
      <enabledValue>
        <decimal value="2" />
      </enabledValue>
      <disabledValue>
        <decimal value="4" />
      </disabledValue>
    </policy>
    <policy
        name="DisableAutoDownloadWin8"
        class="Machine"
        displayName="$(string.DisableAutoDownloadWin8)"
        explainText="$(string.DisableAutoDownloadWin8_Help)"
        key="Software\Policies\Microsoft\WindowsStore"
        valueName="AutoDownload"
        >
      <parentCategory ref="WindowsStore" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <enabledValue>
        <decimal value="2" />
      </enabledValue>
      <disabledValue>
        <decimal value="3" />
      </disabledValue>
    </policy>
    <policy
        name="DisableOSUpgrade_1"
        class="User"
        displayName="$(string.DisableOSUpgradeOption)"
        explainText="$(string.DisableOSUpgradeOption_Help)"
        key="Software\Policies\Microsoft\WindowsStore"
        valueName="DisableOSUpgrade"
        >
      <parentCategory ref="WindowsStore" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy
        name="DisableOSUpgrade_2"
        class="Machine"
        displayName="$(string.DisableOSUpgradeOption)"
        explainText="$(string.DisableOSUpgradeOption_Help)"
        key="Software\Policies\Microsoft\WindowsStore"
        valueName="DisableOSUpgrade"
        >
      <parentCategory ref="WindowsStore" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
  </policies>
</policyDefinitions>

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