function GetFileSize(szFile: String): Cardinal;
var
  fFile: THandle;
  wfd: TWIN32FINDDATA;
begin
  result := 0;
  if not FileExists(szFile) then exit;
  fFile := FindFirstfile(pchar(szFile),wfd);
  if fFile = INVALID_HANDLE_VALUE then exit;
  result := (wfd.nFileSizeHigh*(MAXDWORD))+wfd.nFileSizeLow;
  windows.FindClose(fFile);
end;