rc (ULONG) - returns

      Return codes indicating success or type of failure:

      MMIO_SUCCESS

        If the function succeeds, 0 is returned.
      MMIO_ERROR
        The open failed. Possible reasons for failure include a nonexistent file name or an already open file.
      MMIOERR_INVALID_FILENAME
        No file name was specified.
      MMIOERR_INTERNAL_SYSTEM
        An internal system error has occurred.
      MMIOERR_NO_CORE
        The buffer cannot be allocated.

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