Replay file type

hopefully I am posting this in the right category. I am interested what the file type of the replay/recorded game is (there are two files in the .gz)? Is it possible to find some template?

A bit of update (before I post this). So I saw that one has only “one” Relic Chunky (scratchpad, github), but I am not sure, if this is the answer?

I would like to write some “reader/parser” (or try to) for a hobby purpose to practice one programming language I have just picked up.

Any help is much appreciated. I wish you all a nice end of the week! :beers: