unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls, ComCtrls;

type
  TForm1 = class(TForm)
    Image1: TImage;
    Timer1: TTimer;
    Button1: TButton;
    ListView1: TListView;
    OpenDialog1: TOpenDialog;
    procedure Timer1Timer(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    FCurFolder: string;
    FItemIndex: Integer;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
  Item: TListItem;
begin
  if OpenDialog1.Execute then
  begin
    ListView1.Clear;
    FItemIndex := 0;
    FCurFolder := ExtractFilePath(OpenDialog1.FileName);

    ListView1.Items.BeginUpdate;
    try
      for I := 0 to OpenDialog1.Files.Count - 1 do
      begin
        Item := ListView1.Items.Add;
        Item.Caption := ExtractFileName(OpenDialog1.Files[I]);
        Item.SubItems.Add(OpenDialog1.Files[I]);
        Item.SubItems.Add(ExtractFileExt(OpenDialog1.Files[I]));
      end;
    finally
      ListView1.Items.EndUpdate;
    end;
  end;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  if FItemIndex < ListView1.Items.Count then
    Image1.Picture.LoadFromFile(FCurFolder + ListView1.Items[FItemIndex].Caption);

  if FItemIndex < ListView1.Items.Count - 1 then
    FItemIndex := FItemIndex + 1
  else
    FItemIndex := 0;
end;

end.