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 correct.
      MMIOERR_UNBUFFERED
        Tried to disable a buffer already disabled.
      MMIOERR_INVALID_BUFFER_LENGTH
        The buffer length is invalid.
      MMIOERR_CANNOTWRITE
        The buffer could not be written to disk. It might be full.
      MMIOERR_READ_FAILED
        Set Buffer failed during a read operation.
      MMIOERR_SEEK_FAILED
        Set Buffer failed during a seek operation.
      MMIOERR_WRITE_FAILED
        Set Buffer failed during a write operation.
      MMIOERR_OUTOFMEMORY
        A buffer was expected but not allocated.

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