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var
  Form1: TForm1;
  AFile: String='';					

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procedure TForm1.Speichern1Click(Sender: TObject);
begin
  if AFile='' then
  begin
    if SaveDialog1.Execute then
    begin
      RichEdit1.Lines.SaveToFile(SaveDialog1.FileName);
      AFile := SaveDialog1.FileName;
    end;
  end
  else
    RichEdit1.Lines.SaveToFile(AFile);
end;

procedure TForm1.Oeffnen1Click(Sender: TObject);
begin
  if (OpenDialog1.Execute and FileExists(OpenDialog1.FileName)) then
  begin
    RichEdit1.Lines.LoadFromFile(OpenDialog1.FileName);
    AFile := OpenDialog1.FileName;
  end;
end;