title: ASP.NET MVC 3: RouteExistingFiles = true seems to have no effect
body: <p>I'm trying to understand how RouteExistingFiles works.
  So I've created a new MVC 3 internet project (MVC 4 behaves the same way) and put a HTMLPage.html file to the Content folder of my project.
  Now I went to the Global.Asax file and edited the RegisterRoutes function so it looks like this:</p>
  
  <pre><code>public static void RegisterRoutes(RouteCollection routes)
  {
      routes.RouteExistingFiles = true; //Look for routes before looking if a static file exists
  
      routes.MapRoute(
              "Default", // Route name
              "{controller}/{action}/{id}", // URL with parameters
              new {controller = "Home", action = "Index", id = UrlParameter.Optional} // Parameter defaults
              );
      }
  </code></pre>
  
  <p>Now it should give me an error when I'm requesting a localhost:XXXX/Content/HTMLPage.html since there's no "Content" controller and the request definitely hits the default pattern. But instead I'm seeing my HTMLPage.
  What am I doing wrong here?</p>
  
  <p>Update:
  I think I'll have to give up.
  Even if I'm adding a route like this one:</p>
  
  <pre><code>routes.MapRoute("", "Content/{*anything}", new {controller = "Home", action = "Index"});
  </code></pre>
  
  <p>it still shows me the content of the HTMLPage.
  When I request a url like ~/Content/HTMLPage I'm getting the Index page as expected, but when I add a file extenstion like .html or .txt the content is shown (or a 404 error if the file does not exist).
  If anyone can check this in VS2012 please let me know what result you're getting.
  Thank you.</p>