Do you mean something like this?
procedure TForm1.ImageEnMView1ImageSelect(Sender: TObject; idx: Integer);
var
iFileType: TIOFileType;
begin
iFileType := ImageEnMView1.MIO.Params[idx].FileType;
if iFileType = ioAVI then
ShowMessage('The frame is an AVI file.');
end;
William Miller
Adirondack Software & Graphics
Email: w2m@frontiernet.net
EBook: http://www.imageen.com/ebook/
Apprehend: http://www.frontiernet.net/~w2m/index.html