mmioSetHeader 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 specified file is not a media-file format type.
MMIOERR_INVALID_PARAMETER
An invalid parameter was passed.
MMIOERR_INVALID_HANDLE
The handle passed was not valid.
MMIOERR_SEEK_FAILED
A seek operation prior to a write- or read-advance operation failed.

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