These folders are where all the Traffic.bgl files will go. FS2002 only has one bgl file called Traffic.bgl. FS2004 can have individual one’s for each airline you install so it’s easy to edit/remove/add rather than having one gi-normous file to edit as you can see in my Traffic files folder in the screenshot. FS2004’s default traffic file is Traffic030528.bgl. If you don’t want default traffic in FS then just delete this file, then go to your main FS folder and delete the Aircraft030528.txt and Flightplans030528.txt files. For FS2002/Pro, just delete the Traffic.bgl file, then the Aircraft.txt and Flightplans.txt files from the respective folders. PAI has an excellent installer/de-installer for default traffic if you want to use theirs. It’s on their site.
http://www.surclaro.com/AI_Tutorial/