Are the specs on these files available somewhere?

Maybe tools external to the game can be built to read them.

E.g. info-graphic that displays most allied species, most hated species,

Or a meta-game which displays the state of a multi-galactic war consisting of all you game.

EDIT: The Galactic Empire Chronicles doesn't work in my game by the way.

I don't know if it offers stats outside what is shown in the end screen.

I tried deleting old saved games, and investigating the logs (as suggested in another thread).

Some of the logs did have "errors".

And so deleted games that corresponded to those logs.

No joy.

Thanks, I actually worked it out and posted my findings in a thread from a couple of days before that one: https://www.games2gether.com/endless-space-2/forums/65-general/threads/29782-empire-chronicles-never-displays-any-finishes-fixed?page=1