They do not share a file format. If you look at the GitHub repo for this site (https://github.com/magcius/noclip.website https://github.com/magcius/noclip.websi

They do not share a file format. If you look at the GitHub repo for this site (https://github.com/magcius/noclip.website https://github.com/magcius/noclip.website) you will find parsers, etc. for every single game.