<match value="PE\000\000" type="string" offset="240"/>
      </match>
    </magic>
  </mime-type>
  <!-- the PE header should be PEx00x00 then a two byte machine type -->
  <mime-type type="application/x-msdownload;format=pe32">
    <sub-class-of type="application/x-msdownload;format=pe"/>
    <magic priority="60">
      <match value="PE\000\000" type="string" offset="128">

</p>

<p>
Type unification is controlled by a <i>matching mode</i>, which may
be <i>exact</i> or <i>loose</i>.
As unification recursively descends a composite type structure,
the matching mode used for elements of the type, the <i>element matching mode</i>,
remains the same as the matching mode except when two types are unified for