The ICQueryAbout macro queries a video compression driver to determine if it has an About dialog box. You can use this macro or explicitly call the ICM_ABOUT message.
DWORD ICQueryAbout(
hic
);
Returns ICERR_OK if the driver supports this message or ICERR_UNSUPPORTED otherwise.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in vfw.h.
Video Compression Manager Overview, Video Compression Macros, ICM_ABOUT