rc (ULONG) - returns

      Return codes indicating success or type of failure. For more information about DOS File errors, use the mmioGetLastError function.

      MMIO_SUCCESS

        If the function succeeds, 0 is returned.
      MMIO_ERROR
        The specified file is not a storage-system type.
      MMIOERR_INVALID_PARAMETER
        An invalid parameter was passed.
      MMIOERR_INTERNAL_SYSTEM
        An internal system error occurred.

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