This message attempts to determine if any IOProc can process a file or file element. It does not require that the file be already opened by MMIOM_OPEN.

pmmioinfo (PMMIOINFO)

An MMIOINFO block is optional for this message.

usMsg (USHORT)

Set to MMIOM_IDENTIFYFILE.

lParam1 (LONG)

An optional pointer to a string, pszFileName, containing the name of the file to be evaluated. This string must be provided by the sender of the message. It should follow the form defined by the mmioOpen function.

lParam2 (LONG)

An hmmio file handle must be specified. The IOProc uses this handle to read from the file instead of opening the file again.

rc (ULONG)

Return codes indicating success or failure:

MMIO_SUCCESS

The file in the format of, and supported by this IOProc.
MMIO_ERROR
The file cannot be supported by this IOProc.

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