Install this update if you receive the "String is too long" error when trying to open a Group Policy object from a computer running Windows Server 2003 64-bit Edition and Windows XP 64-bit Edition, Version 2003. Once you have installed this item, it cannot be removed.
Download: Update for Windows XP/2003 64-bit Edition (KB842933)
System Requirements
Supported Operating Systems: Windows Server 2003
Windows XP 64-bit Edition, Version 2003
Related Resources

Windows XP 64-Bit Edition, Windows XP 64-Bit Edition 2004, and Windows Server 2003 64-Bit have been around for a long time. Those are for the Itanium and Itanium 2 processors.
Windows XP for 64-Bit Extended Systems and Windows Server 2003 for 64-Bit Extended Systems have not been released.
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