how to save a air file

i wanted a b777-200 and 300 base model but posky only had the models flight dynamics and repaint kit how do i save the air files so it works
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=13&t=34822
their also nice to post fde updates but the fdes i added arent working like in notepad it comes up normally like a cfg file but in a regular air file its very irredables