We know from reverse engineering efforts, and accounts by developers on the PC port, that all of the mainline MGS games used a proprietary scripting system called GCX. This was effectively a Konami fork of TCL - see eg https://github.com/Jayveer/Gcx
Konami built a custom lighting format for at least MGS3 called LA2, and a proprietary audio format called SDT. So far these haven't been reverse engineered - the leak will definitely open up progress there.
https://boards.4chan.org/vr/thread/12541637/metal-gear-solid...
The re-constructed URL:
Almost no coverage on HN or mainstream media though. Surprising, considering the popularity of this game.
I’ve been having fun lately with agents and decompilation. You can literally point them at any game and ask them to decompile the game and structure and format as if it was the original source code. Asking them to ensure it compiles works fine.
Some proof: i made online save game editors for jagged alliance 3; grandcheaten.com and news tower; thedailycheat.com (.com domains are only $10 so i figured why not).
You can do this with any game i’ve found. Older games work best due to the forced simplicity of the source code though.