rc (USHORT) - returns

      Return codes indicating success or type of failure:

      MMIO_SUCCESS

        If the function succeeds, 0 is returned.
      MMIOERR_INVALID_HANDLE
        The handle passed was not valid.
      MMIOERR_CANNOTWRITE
        The buffer could not be written to the disk. The disk could be full.
      MMIOERR_WRITE_FAILED
        The buffer could not be written to the disk. This is a possible hardware problem.
      MMIOERR_NO_BUFFER_ALLOCATED
        A buffer was expected but was not present.
      MMIOERR_NO_FLUSH_NEEDED
        A mmioFlush function was requested, but the buffer was empty.
      MMIOERR_NO_FLUSH_FOR_MEM_FILE
        A mmioFlush was requested on a MEM file.

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