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procedure TForm1.Button2Click(Sender: TObject);
type
  TCopyBuffer = array[0..4095] of Char;
var
  Buffer: ^TCopyBuffer;
  Source, Dest: file;
  RetVal: Integer;
begin
  New(Buffer);

  try
    AssignFile(Source, 'C:\meinsong.mp3');
    Reset(Source, 1);

    AssignFile(Dest, 'C:\test.txt');
    Rewrite(Dest, 1);

    while (not Eof(Source)) do
    begin
      BlockRead(Source, Buffer^, SizeOf(Buffer^), RetVal);
      BlockWrite(Dest, Buffer^, RetVal);
    end;

    CloseFile(Source);
    CloseFile(Dest);

    Memo1.Lines.LoadFromFile('C:\test.txt');
  finally
    Dispose(Buffer);
  end;
end;                    

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var
  FS: TFileStream;
  Inhalt: String;
begin

  ...  // hier wird irgendwo "Inhalt" befuellt

  FS := TFileStream.Create('meinedatei.txt', fmCreate);
  FS.Write(PChar(Inhalt)^, Length(Inhalt));
  FS.Free();

end;