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procedure TForm1.Button9Click(Sender: TObject);
var idhttp1:tidhttp;
    datei:tfilestream;
begin
    IdHttp1:=tidhttp.create;
    try
      try
        Datei:=TFileStream.create('test.pdf',fmCreate);
        IdHttp1.Get('http://www.kepler.c.sn.schule.de/subj/MA/12Ma4/lk01_b.pdf',Datei);
      finally
        Datei.free;
      end;

      try
        Datei:=TFileStream.create('test.txt',fmCreate);
        IdHttp1.Get('https://skydrive.live.com/redir?reD890F982C539013!105/test.txt',Datei);
        //IO Handler is not valid
      finally
        Datei.free;
      end;

    finally
      IdHttp1.free;
    end;  
end;					

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function DownLoadInternetFile(const SourceUrl, DestFilename : String): Boolean;
const S_OK = 0;
begin
   Result := URLDownloadToFile(nil,PChar(SourceUrl),PChar(DestFilename),0,nil) = S_OK;
end;

procedure TForm1.Button1Click(Sender: TObject);
var fn : String;
begin
fn:='http://www.kepler.c.sn.schule.de/subj/MA/12Ma4/lk01_b.pdf';
if DownLoadInternetFile(fn, 'D:\lk01_b.pdf') then ShowMessage('Download ok');

fn:='https://skydrive.live.com/redir?reD890F982C539013!105/test.txt';
if DownLoadInternetFile(fn, 'D:\test2013.txt') then ShowMessage('Download ok');
end;