title: p:media with PDF file causes "File does not begin with '%PDF-'." error in IE7
body: <p>I'm using <code>&lt;p:media&gt;</code> based on this question&amp;answer: <a href="https://stackoverflow.com/questions/14232339/how-to-bind-dynamic-pdf-content-using-pmedia">How to bind dynamic content using &lt;p:media&gt;?</a>   </p>
  
  <p>It doesn't work in IE7 while it works fine Mozilla and Chrome. IE7 errors as:</p>
  
  <blockquote>
    <p>File does not begin with '%PDF-'.</p>
  </blockquote>
  
  <p>I understood it's because the file name for generated PDF is <code>dynamiccontent.properties.xhtml</code>. How do I change the file name? I tried passing the file name in <code>DefaultStreamedContent</code> constructor, but it had no effect.</p>