XBAP - This application type has been disabled

Or you can enable XBAP applications in IE9.

Security -> .NET Framework -> XAML browser applications

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Here is an explanation:

Apparently you can undo the change IE9 made to URLACTION_WINDOWS_BROWSER_APPLICATIONS or you could change the zone for your site.

.net wpf internet-explorer-9 xbap

Or you can add derewnoakes.com to the Trusted sites.

CodeHunter