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uses Registry;

procedure TForm1.Button1Click(Sender: TObject);
var
  Reg: TRegistry;
begin
  Reg := TRegistry.Create;
  try
    Reg.RootKey := HKEY_CURRENT_USER;
    if Reg.OpenKey('\Software\Winrar\General', True) then
    begin
      Showmessage(Reg.ReadString('LastFolder'));
      Reg.CloseKey;
    end;
  finally
    Reg.Free;
    inherited;
  end;
end;