It might not be what you hoped to hear but more than ten years ago I was advised not to contemplate changing from XP to Windows 7 because toolpath might not function.I don't now recall the exact version of toolpath but it may well have been 2.8 and even then it rejected with file names of more than eight characters.Both myself and the machine have moved on since those days.The suppliers of the RS485 might have a solution but it could come with a price tag.