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

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

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