» Question:
Every time I hit save, a new file is created, thus I'll end up with five part1.prt files. How to fix this?

Answer::-)
This is the way pro/e functions. If you are certain that you don't need to use the old files, you can purge them using File -> Delete -> Old Versions - it prompts for the filename (default the open file).

:-) You can also set up a mapkey that saves and purges at the same time.
That will keep your working dir clean. Depending on how you set the order you can have two or just one version saved.

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