Default simulator road traffic

[TransportFan2014]

I have a question: which files should I be looking into (in the directory for FSX) to locate where the default ground vehicles are stored? Simply because I intend to run some projects with my copy of FSX Steam, one of which includes pulling off an identical feat to one 3rd-party developer of MSFS2020 (which tweaks the ground traffic across the in-sim world where each region has specific vehicles appropriate to that region). Thanks.