Możesz odszyfrować niektóre z plików
and
Możesz odszyfrować niektóre pliki
both sounds pretty natural. 2nd is simpler and slightly better. First is more like:
You can decipher some among those files
and 2nd is more like:You can decipher some files.
Cool thanks!
I guess another possibility I hadn't previously considered is that Google translate improved their algorithm slightly since the hacker used it and I used it.