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I’m trying to access through Control Webbrowser of Windows Forms . net 4.0 a page that requires a digital certificate. The site is only approved for versions 8 and 9 of the IE. The IE version of the machine is 11. When direct access from the browser need to put in compatibility mode to work. When accessing through the Webbrowser Control it gives script error saying that it cannot create the Active X object "Geckoactivexobject is not set". 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 I did not get a positive result. The only way it works is by using a Webbrowser Control in a WPF project with framework 4.5. Someone knows some way to work in windows Forms with . net 4.0. Sincerely yours.