Вывести диалог "Обзор папок"

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uses ShlObj;

procedure CallBack(wnd: hWnd; uMsg: UINT; lParam, lpData: LParam) stdcall;
begin
  SendMessage(wnd, BFFM_ENABLEOK, 0, 1);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  bi: TBrowseInfo;
  s: PChar;
  PIDL, ResPIDL: PItemIDList;
begin
  SHGetSpecialFolderLocation(Form1.Handle, CSIDL_DESKTOP, PIDL);
  s := StrAlloc(128);
  bi.hwndOwner := Form1.Handle;
  bi.pszDisplayName := s;
  bi.lpszTitle := 'Выбор прапки';
  bi.pidlRoot := PIDL;
  bi.lpfn := addr(CallBack);
  ResPidl := SHBrowseForFolder(BI);
  SHGetPathFromIDList(ResPidl, s);
  Form1.Caption := s;
end;