

FFS, you could just have run gzip on it probably.
Gzip doesn’t reduce your data’s size by 2000x. Of course this could be done by other languages as well, but running gzip on your data doesn’t keep it accessible.
Even turning the data into a Parquet file would’ve been a massive improvement, while keeping it accessible, but it likely would not have been 2000x smaller. 10x, maybe.
edit: zip: about 10x; 7zip about 166x (from ~10GB to 60MB) - still not 2000x
Presuming you can’t get a game on GoG (which is European), check if the game is still from Europe.
Bit of a compromise, but this is for the people who can’t give up on Steam.