How do I turn off Compatibility View on the IE WebBrowserControl in a WinForms app?

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There is no way to do this other than configuring the following registry settings:

HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION

or if it’s a 32 bit app on 64 bit Windows:

HKLM\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_BROWSER_EMULATION`

These settings aren’t surfaced in the WebBrowser control.

For more information please see:

What IE compatibility mode does the webbrowser control use?

In case the link dies:

You create a DWORD value matching the name of your executable and set this value to one of:

7000: Pages containing standards-based <!DOCTYPE> directives are displayed in IE7 mode.
8000: Pages containing standards-based <!DOCTYPE> directives are displayed in IE8 mode
8888: Pages are always displayed in IE8 mode, regardless of the <!DOCTYPE> directive. (This bypasses the exceptions listed earlier.)
9000: Use IE9 settings!
9999: Force IE9

For example:

enter image description here

From my own experiments with IE9:

  • 9000 – inherits the compatibility mode set in IE9’s global compatibility mode setting. i.e.:
    enter image description here

  • 9999 – forces IE9 out of compatibility mode in the host application regardless of the globally configured compatibility mode setting

Your application would probably need to detect which underlying IE version is available to determine which value to use:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Version

or if it’s a 32 bit app on 64 bit Windows: 

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\Version

There’s also this older article from when IE8 came out which is worth a look:

More IE8 Extensibility Improvements

You can also configure these settings on a per user basis under:

HKCU\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION

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