If its RPGmaker, I wrote an app that allowed me to save off all of the images used in Manila Shaw.
I haven't uploaded the images anywhere because it ended up being an extremely large folder of several gigs, and it would make more sense to upload the app instead.
If this game is also RPGmaker and it has those "encrypted" image files, I would only need to change the key to make it work for this game.
For Manila Shaw, only the first few bytes were XOR'd with a hard-coded key sitting plaintext in the javascript.