Add a file extension mapping on IIS for ASP.NET handler

• Right click the Web site or the virtual directory and then select Properties.
• Select Configuration button on Home Directory tab (for Web site) or Directory (for virtual directory).
• On Mappings tab, click Add.
• For ASP.NET 2.0 or later,

  Executable	C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll
  Extension	the file extension you want to map, e.g., .simple

  
  Here is an example.
  
  
• Click OK, then Apply or OK.
• Exit the wizard