They might not still have the game source and/or knowledge on how to recompile the game. There are lots of technical reasons that it might be entirely unworkable to do that even if they wanted to.
(disclosure: work in video games at a big studio where I know for certain there are things we couldn't build again at this point without a ton of work)
(disclosure: work in video games at a big studio where I know for certain there are things we couldn't build again at this point without a ton of work)