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_INVALID_PARAMETER
A parameter passed was not correct.
MMIOERR_CHUNKNOTFOUND
The end of the file (or the end of the parent chunk, if given) is reached before the desired chunk is found.

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