VS 6.0 Länkfel vid .dll

Någon som vet varför/hur detta länkningsproblemmet uppstår i Visual Studio 6.0 med Service Pack 5

--------------------Configuration: IEToolbar - Win32 Debug--------------------
Creating Type Library...
Microsoft (R) MIDL Compiler Version 5.01.0164  
Copyright (c) Microsoft Corp 1991-1997. All rights reserved.
Processing D:\ola\projects\prisbevakaren.net\c-source\IEToolbar\IEToolbar.idl
IEToolbar.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\oaidl.idl
oaidl.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\objidl.idl
objidl.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\unknwn.idl
unknwn.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\wtypes.idl
wtypes.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\ocidl.idl
ocidl.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\oleidl.idl
oleidl.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\servprov.idl
servprov.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\urlmon.idl
urlmon.idl
Processing C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\msxml.idl
msxml.idl
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\urlmon.idl(486) : error MIDL2025 : syntax error : expecting a type specification near "DWORD"
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\urlmon.idl(487) : error MIDL2026 : cannot recover from earlier syntax errors; aborting compilation 
Error executing midl.exe.

IEToolbar.dll - 2 error(s), 0 warning(s)

"Letar" man upp vad den klagar på så kommer man till "c:\.../VC98/include/URLMON.IDL" och den klagar på en DWORD... även om man kommentar bort denna koden så funkar det inte...