Оформил: DeeCo

procedure TForm1.Button1Click(Sender: TObject);
begin
  if OpenDialog1.Execute then
  begin
    Image1.Picture.Icon.LoadFromFile(OpenDialog1.FileName);
    Edit1.Text := OpenDialog1.FileName;
    ImageList1.AddIcon(Image1.Picture.Icon);
    Edit2.Text := IntToStr(ImageList1.Count);
  end;
end;