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procedure CompressFile(FileName:String);
var Stream,DestStream:TMemoryStream;
var CompressionStream:TCompressionStream;
begin
  Stream:=TMemoryStream.Create;
  try
    Stream.LoadFromFile(FileName);
    DestStream:=TMemoryStream.Create;
    try
      //Kompressionsstream erstellen, komprimierte Daten landen in DestStream
      CompressionStream:=TCompressionStream.Create(clMax, DestStream);
      try
        Stream.Position:=0;
        //Inhalt des Streams in CompressionStream einlesen)
        CompressionStream.Write(Stream.Memory^,SizeOf(Stream));
      finally
        CompressionStream.Free;
      end;
      //Komprimierte Daten speichern
      DestStream.SaveToFile(Filename);
    finally
      DestStream.Free;
    end;
  finally
    Stream.Free;
  end;
end;