title: Adding MimeMap via WIX failed
body: <p>I've been given a bug to fix an installer issue.  Unfortunately, I know nothing about WIX, so I am not exactly where to start.</p>
  
  <p>The WXS file is adding the necessary MimeMap, but when QA installed our app on Windows 2003 with IIS6, the MIME type was not set.</p>
  
  <p>I am not sure where to start.  We are using Wix 3.0.  Here is the XML:</p>
  
  <pre><code>&lt;iis:WebSite Id="DefaultWebSite" Description="Default Web Site"&gt;
    &lt;iis:WebAddress Id="AllUnassigned" Port="80" /&gt;
    &lt;iis:MimeMap Id="registerXapMimeType" Extension=".xap" Type="application/x-silverlight-app"/&gt;
  &lt;/iis:WebSite&gt;
  </code></pre>
  
  <p>Any idea to why this MIME type was not mapped?</p>