The "Loose XAML files" current user setting should be configured correctly for the Locked-Down Trusted Sites Zone. enabled/disabled User Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page\Locked-Down Trusted Sites Zone\Loose XAML files HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2 Microsoft Tool: Security Compliance Manager (SCM) Microsoft Baseline: Internet Explorer 8 SCM URL: http://go.microsoft.com/fwlink/?LinkId=113940 Microsoft Security Compliance Manager (SCM) Baselines and Settings Packs Microsoft