Some of the unused DAT files of FFVII are not LZSS encoded in any version of the game, but a couple of them are encoded in the first Japanese release but not encoded in all subsequent releases.
Examples:
FALLP.DAT
Contains a lot of script in FFVII-J, but not encoded in FFVII-I.
PASS.DAT
Has no dialogue in FFVII-J, but is encoded in contrast to its FFVII-I counterpart.
Speaking as an amateur without any programming skills, and without actually knowing what an "LZSS encoding" is,
I wonder if it might actually be possible to reverse-engineer this encoding process and thus unlock the unused files which are not properly encoded in any version of the game.
Could it be done?