ASP.NET MVC Routing vs. Reserved Filenames in Windows

This has been addressed in ASP.NET 4. http://haacked.com/archive/2010/04/29/allowing-reserved-filenames-in-URLs.aspx

You can apply a setting in web.config that relaxes this restriction.

<configuration>
  <system.web>
    <httpRuntime relaxedUrlToFileSystemMapping="true"/>

    <!-- ... your other settings ... -->
  </system.web>
</configuration>

Hope that helps.