rc (ULONG) - returns

      Return codes indicating success or type of failure:

      MMIO_CF_SUCCESS

        If the function succeeds, 0 is returned.
      MMIOERR_INVALID_HANDLE
        The handle passed was not valid.
      MMIOERR_INVALID_PARAMETER
        For this function a null pszElementName, pchBuffer, or cchBytes is invalid.
      MMIOERR_READ_ONLY_FILE
        The RIFF compound file is opened as read-only.
      MMIO_CF_FAILURE
        The function failed. A call to mmioGetLastError may return:

        MMIOERR_INTERNAL_SYSTEM

          The operation failed due to an internal system error.

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