mmioCFCompact Return Value - rc

rc (ULONG) - returns

Return codes indicating success or type of failure:

MMIO_SUCCESS

If the function succeeds, 0 is returned.
MMIO_ERROR
The open failed. Possible reasons for failure include a nonexistent file name or an already open file.
MMIOERR_INVALID_FILENAME
No file name was specified.
MMIOERR_INTERNAL_SYSTEM
An internal system error has occurred.
MMIOERR_NO_CORE
The buffer cannot be allocated.

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