Cannot transfer old game to new computer

[PEM]

OK I am over half way thru the game and got a new computer. I posted to this forum previously and the answer to do this was copy the file that had my name followed by .plt to a disk and then load it into the new computer game file. Tried that but the game starts me off from the beginning. What am I doing wrong? I am start from disk two, do I need to start with disk one and wait for it to tell me to load disk two or what?

Thank you for your time.

Eric