Win2000 and ATL COM project

I have ATL COM project created in DevStudio 6.0 under WinNT. Now I try compile under Win2000 Prof (Candidate Release 2).
 During MIDL compilation are generated errors at 'urlmon.idl'. Uknown SECURITY_ATTRBUTES (line 489), DWORD (523) and (764) HRESULT.

Do you know an explanation?
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Sounds to me like your installation of Visual C++ is incomplete on the W2K box.  Please check it and also make sure you have Visual Studio SP3 which is required for use on W2K.

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