title: IIS 7.5 Can't open Handler Mappings?
body: <p>I need to update the handler mappings on IIS 7.5 to allow URLs that don't have extensions to be routed to an application. The application was originally written in ASP.NET 2.0, but then later upgraded to ASP.NET 3.5. I don't know if that has relevance, but I've had no problem updating handler mappings for other .net 3.5 apps before. I should also note that this works fine on IIS 6.0</p>
  
  <p>This is the error message I get when I click the Handler Mappings link in IIS 7.5 (notice there isn't really an error message as such, which would be helpful): </p>
  
  <blockquote>
    <p>Handler Mappings</p>
    
    <p>There was an error while performing this
    operation.</p>
    
    <p>Details: </p>
    
    <p>Filename: \?\D:\path\to\web.config</p>
    
    <p>Error: </p>
    
    <hr>
    
    <p>OK   </p>
  </blockquote>
  
  <p>Has anyone seen this before? If you need more info, let me know and I'll supply. Thanks.</p>