Geting file size using wininet?

Hi I use wininet library for downloading file from net.I use this function for getting file size, but this function not work properly don't give me results(return 0) for any URL (valid URL)       especially on bigger files.What is problem with bigger files??or how to detect redirect?
nn ex.
http://download2.gamespot.com/d4/gsc/action/fearcombat/fearcombat_en_107.exe (return 0)

http://us.rd.yahoo.com/games/buzz/downloads/486514/SIG=1344l74qj/*http%3A//h.yimg.com/download2.games.yahoo.com/games/buzz2/
content/p/0/486514/paraworld_sp_demo.exe (return 1.3GB)


Please give me some idea or function for this

function TMainForm.GetResourceSize(const AURL: string): Integer;
var
  hOpen, hConnect, hResource: HINTERNET;
  host, resource: string;
  buflen, tmp: Cardinal;
begin
  ParseURL(AURL, host, resource);

  hOpen := InternetOpen('WinInet resuming sample', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
  if  Assigned(hOpen) then edtFile.Text:=edtFile.Text+' 1 OK ' else edtFile.Text:=edtFile.Text+' 1 NO ';
  hConnect := InternetConnect(hOpen, PChar(host), INTERNET_DEFAULT_HTTP_PORT, nil, nil, INTERNET_SERVICE_HTTP, 0, 0);
  if  Assigned(hConnect) then edtFile.Text:=edtFile.Text+' 2 OK '  else  edtFile.Text:=edtFile.Text+' 2 NO ';
  hResource := HttpOpenRequest(hConnect, 'HEAD', PChar(resource), nil, nil, nil, 0, 0);
  if  Assigned(hResource) then edtFile.Text:=edtFile.Text+' 3 OK ' else  edtFile.Text:=edtFile.Text+' 3 NO ';

    HttpSendRequest(hResource, nil, 0, nil, 0);

  buflen := SizeOf(Result);
  tmp := 0;
  Result := 0;
  HttpQueryInfo(hResource, HTTP_QUERY_CONTENT_LENGTH or HTTP_QUERY_FLAG_NUMBER,
    @Result, buflen, tmp);

  InternetCloseHandle(hConnect);
  InternetCloseHandle(hOpen);
end;



Regards, Nikola