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procedure TForm1.Button2Click(Sender: TObject);
var
  F: TextFile;
begin
  AssignFile(F,'C:\Edit.txt');
  {$I-}
    ReWrite(F);
  {$I+}
  try
    if IOResult=0 then
      WriteLn(F, texte);
  finally
    CloseFile(F);
  end;
end;					

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ReWrite(F);					

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Append (F);