WinError.h
I have it on the next path on my machine, yours will also look like:
C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\include\WinError.h
By the way, if you have Visual Studio installed, there is a tool available under the name "Error Finder". Go to Visual Studio, Tools-> Error Lookup, and you can put any HRESULT code in it to get its description. You can download ErrorLookup from this location .
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