The ICM_ABOUT message is sent to a video compression driver to display its About dialog box.
Parameters
dwParam1
Specifies a handle to a window (HWND) that should correspond to the parent of the displayed dialog box.
If dwParam1 is –1, the driver returns ICERR_OK if it has an About dialog box but it should not display the dialog box. The driver returns ICERR_UNSUPPORTED if it does not display a dialog box.
dwParam2
Not used.
Return Value
Returns ICERR_OK if the driver supports this message. Otherwise, returns ICERR_UNSUPPORTED.