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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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procedure TForm2.Button1Click(Sender: TObject);
var
  i:integer;
begin
SetLength(a,200);
for I := 0 to 199 do
begin
A[i]:=Tedit.Create(self);
  with A[i] do
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