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STDAPI CoCreateInstance(
    REFCLSID rclsid,
    LPUNKNOWN pUnkOuter,
...
    REFIID riid,
    LPVOID * ppv
);

typedef struct _GUID {          // size is 16
    DWORD Data1;
...
    WORD   Data3;
    BYTE  Data4[8];
} GUID;