Hello every body. I have a question. What can i open s7 300 program in the arj format in s7 300 plc software.We have a machine which system have a mmc 840d. We have s7 300 software,cp 5511 comunication cable but in the machine s7 300 program have a pasword cant upload it whit s7 300 software.I can upload in the arj format on the mmc 840d.please help mi. thanks again.