Newbie question - finding Custom game start files

[Dinadin]

Hi! In Beta 9 developers removed the Frontier equipment from the custom game starts, even a non-budgeted one. And while I'm familiar a bit with the Catalog Tool, I can reliably find only equipment(ships, weapons etc) files, but looking for something that controls the availability of stuff in creative start requires a deep understanding of naming and the directory structure, and so far I don't have experience with it
So I would like to ask for a bit of help to point me to these exact files.
Additional humble request to point me to the files that control default faction relations - I want to make HOP and ANT non-hostile by default.