Download Microsoft .NET Framework 3.5 Service Pack 1 Update for Windows Server 2003 and Windows XP from Official Microsoft Download Center

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Microsoft .NET Framework 3.5 Service Pack 1 Update for Windows Server 2003 and Windows XP

This update will disable the Web Browser ActiveX control (WebOC) when running WPF XAML Browser Applications (XBAPs) in the Firefox browser in partial trust.