title: How to modify XML file with wix toolset
body: <p>I have XML file that include a next content:</p>
  
  <pre><code>    &lt;!--&lt;appcache appCacheType="None" /&gt;--&gt;
  &lt;appcache appCacheType="SingleClient" defaultExpiration="3600"/&gt;
  </code></pre>
  
  <p>On installation patch i need to change this content in XML file to:</p>
  
  <pre><code>    &lt;appcache appCacheType="None" /&gt;
      &lt;!--&lt;appcache appCacheType="SingleClient" defaultExpiration="3600"/&gt;--&gt;
  </code></pre>
  
  <p>What is a better way to do it?</p>
  
  <p>Thanks.</p>