{ This code shows the standard file properties dialog like in Windows Explorer }
uses
shellapi;
// Thanks to Peter Below (TeamB) for this code
procedure PropertiesDialog(FileName: string);
var
sei: TShellExecuteInfo;
begin
FillChar(sei, SizeOf(sei), 0);
sei.cbSize := SizeOf(sei);
sei.lpFile := PChar(FileName);
sei.lpVerb := 'properties';
sei.fMask := SEE_MASK_INVOKEIDLIST;
ShellExecuteEx(@sei);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
if Opendialog1.Execute then
PropertiesDialog(Opendialog1.FileName);
end;