I am trying to access through the Windows Forms .NET 4.0 WebBrowser Control a page that requires a digital certificate. The site is only approved for versions 8 and 9 of IE. The IE version of the machine is at 11. When direct browser access I need to put in compatibility mode to work. When access through the WebBrowser Control it gives error of talking script that can not create the Active X object "GeckoActiveXObject is not defined". I searched and saw that I would need to add a value to a registry key (FEATURE_BROWSER_EMULATION) to run the WebBrowser control in compatibility mode I put all possible values and did not get positive result. The only way it works is by using a WebBrowser control in a WPF project with framework 4.5. Does anyone know of any way to work in windows forms with .NET 4.0. Sincerely.