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sFile := SaveDialog1.filename;
if not fileexists(sFile) then
begin
  if SaveDialog1.Execute then
  begin
  ... ...
  end;
end else begin
  //Ö±½Ó±£´æ
end;

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procedure TForm1.Save1Click(Sender: TObject);
begin
  if SaveDialog1.Execute then
        wb1.Lines .SaveToFile(SaveDialog1 .FileName);
 
end;
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