title: Directory browsing stops working in App_Data directory
body: <p>Question:</p>
  
  <p>In my ASP.NET web solution, I have a directory called redlines.</p>
  
  <p>Into it, I put this web.config, to make the directory browsable.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;configuration&gt;
      &lt;system.webServer&gt;
          &lt;directoryBrowse enabled="true" /&gt;
      &lt;/system.webServer&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p>Now it works fine.
  But when I move the entire redlines directory into App_Data, wanting to browser the folder redlines, I get HTTP 403.</p>
  
  <p>I copy the same web.config into App_Data, because I thought that might help, but it didn't.</p>
  
  <p>What's the problem ? (IIS development server, Visual Studio 2010)</p>