This is by far the most popular question. And the answer is pretty straight forward. The application works with ADX and XDF file which are pretty well known in the GM community as they are used with TunerPro tuning software. If you're already familiar with TunerPro, you know about these files and you might already have them. If that's the case, you're all set. If not, you might still be in luck. You will have to look for ADX file (for data logging) or XDF file (for tuning) on your respective car forums. Some forums specialized in tuning such as GearHead EFI
or PCM Hacking
might have these files you're after.