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_CANNOTWRITE
The I/O buffer needs to be written to disk but disk space is lacking.
MMIOERR_WRITE_FAILED
Unable to write the buffer to disk. Possible hardware problem.
MMIO_WARNING
The file was closed, but the IOProc might be expecting additional data.

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