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//MainForm
procedure TMain.FormShow(Sender: TObject);
begin
Start.Download;
end;

//StartForm

var
  Start: TStart;
  List:TStringList;

implementation

Uses Unit1;

{$R *.dfm}

Procedure TStart.Download;
begin
List.Create;
List.Text:= IDHttp1.Get('http://www.happy-pcs.de/shop/file1.data');
List.SaveToFile(ExtractFilePath(ParamStr(0))+'\file1.data');
end;                    

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List:=TStringList.Create;                    

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List.Free;