How does the Parts Trainer work?

[Fatal1ty4lyF]

I've downloaded this program but it doesnt seem to work.The program is currently on the NFSU 2 folder with the exe and I have a few questions.

Does it work on which mode(Career or Quick Race?)
When do I activate it?

I read the manual and did everything it said bt it doesn't seem to be working out.Any help would be appreciated.Thanks