Hi Bob,
Which version of C63? Since C6.3.9057 onwards introduced more stringent validation while compiling which reported the Duplicate errors.
Even though the duplicates are reported in OLEAUT32.lib, the problem might be that more than one 3rd party product is using them. For example, Capesoft's File Explorer & office Inside both use it. Make sure you are using the latest C73 patch for the 3rd party products and check your global settings for these products since there might be options to exclude these references in case they are being referenced already by another product.
Regards