On next release, Windows 2000 will be no longer supported.
The reason is:
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Microsoft is going to end all of their support on Windows 2000 in July 2010.
Windows 2000 End-of-Support Solution Center
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Microsoft no longer adds any new functionality to Windows 2000, that means it's hard to utilize new features those are available on newer windows for KG-Chart.
I guess nobody is using Windows 2000 any more, so I hope it should be OK...