The easiest way to tell which version of Pro/Engineer a model was made in is to open up the part (.prt) file in a text editor (such as notepad) and look at the first line of text. This will show you the necessary information. As an example. #UGC:2 ASSEMBLY 1068 440 0 1 1 15 2100 2000050 0000b335 \ #- VERS 0 0 \ #- HOST in this listing, the 2100 signifies v21 or 2000i and 2000050 is the build number.
Here's another quick Pro/E tip:
How do you specify what folder Pro/E defaults to when opening new a model? Simply use the config.pro option: "file_open_default_folder"