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Gaaa. Never trust another's logging capabilities. I don't know why I didn't try this myself. Any API that does modified base64 encoding though?

Thanks for the suggestion Salem.
hRequest = WinHttpOpenRequest( hConnect,
A2W(httpMethod),
A2W(relativeURI),
L"HTTP/1.1",
WINHTTP_NO_REFERER,
...

I noticed that '_' (underscore) characters are being converted to ' ' (whitespace) in my URL. I'm not sure what I should do to get around this issue. Also, if someone knows of any MS APIs that do...