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_INVALID_PARAMETER
        An invalid parameter was passed.
      MMIOERR_UNBUFFERED
        The specified file is not opened for buffered I/O.
      MMIOERR_READ_FAILED
        A read-advance operation failed.
      MMIOERR_SEEK_FAILED
        A seek operation prior to a write- or read-advance operation failed.
      MMIOERR_WRITE_FAILED
        A write-advance operation failed.

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