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I'm not Windows development

I'm not Windows development guru, so I'm not sure.
The DLLs are compiled with Microsoft Visual C++ with /LD switch (create DLL). I suspect, these DLLs are Cdecl because made with C/C++ without any additional settings.

Because LibRaw is distributed in open-source, you can easily modify it as you wish, including functions calling conventions.

-- Alex Tutubalin @LibRaw LLC