Has anyone ever run into a problem where a wildcard mapping was overriding a standard mapping? Is this expected behavior? In my case I have my wildcard mapped to aspnet_isapi.dll for a cms application and then the .iirf extension mapped to the .iirf dll. However, I noticed that the .iirf requests are going to asp.net and erroring out rather then going to the .iirf dll. When I remove the aspnet wildcard mapping, then it seems to work properly.