Den OpenDialog-Teil, evtl. entfernen.
Delphi-Quellcode:
procedure TForm1.Button1Click(Sender: TObject);
var
tf: TextFile;
begin
if OpenDialog1.Execute then
begin
AssignFile(tf, OpenDialog1.FileName);
ReWrite(tf);
WriteLn(tf, 'Hello World!');
CloseFile(tf);
end;
end;