mmioIdentifyFile Return Value - rc

rc (ULONG) - returns

Return codes indicating success or type of failure. For information about DOS File errors, use the mmioGetLastError function.

MMIO_SUCCESS

If the function succeeds, 0 is returned.
MMIO_ERROR
The function failed for a reason different from any of the following returns in this list.
MMIOERR_INVALID_PARAMETER
An invalid parameter was passed.
MMIOERR_INTERNAL_SYSTEM
An internal system error occurred.

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