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Not being able to edit the files from the Stand Alone is intentional.
If you edit the files from X:\whatever\Game Guru\Files\titlesbank (where you installed GG), these are the files/changes that will end up in the Stand Alone (encrypted titlesbank directory)
-+- There are only 10 types of people in the world. Those who understand binary, and those who don't -+-
-+-------------------[Chipset:Z390 CPU:i9.9900K GPU:R9 Fury RAM:32GB DDR4 WIN:10.x64 PRO]--------------------+-