I managed to make a (poorly made) script that takes files extracted from a specific archive from an early XY build, specifically an archive that holds "gflib text/message files", and attempt to decrypt and extract said text. Unfortunately, the text for some reason is truncated, but...
Well, just look at picrel for yourself.
Script:
https://files.catbox.moe/mj4o1k.pyraw "Gflib message files" extracted from the archive (specifically for script/story text):
https://files.catbox.moe/lxibph.7zDump of decrypted text from said files:
https://files.catbox.moe/jows4e.txtPicrel was the only hit for that word, so make of this what you will.