There is no build provider registered for the extension '.rss'
<p>I tried to make a .rss file in my ASP.NET application work like a .ashx and although I did everything I was supposed to, I am still getting this error:</p>

<p>There is no build provider registered for the extension '.rss'. You can register one in the  section in machine.config or web.config. Make sure is has a BuildProviderAppliesToAttribute attribute which includes the value 'Web' or 'All'.</p>

<p>There IS a build provider registered!</p>

<pre><code>&lt;buildProviders&gt;
  &lt;add extension="*.rss" type="System.Web.Compilation.WebHandlerBuildProvider"/&gt;
&lt;/buildProviders&gt;

&lt;httpHandlers&gt;
  &lt;remove verb="*" path="*.rss"/&gt;
  &lt;add verb="*" path="*.rss" type="System.Web.UI.SimpleHandlerFactory"/&gt;
  ...
</code></pre>

<p>I also added .rss in the IIS config. What is left to do?! Using ASP.NET 3.5</p>
