Read posts before yours, is known FF9 PC/iOS/Android is made whit unity, extra work to read/write unity saves is needed, the keys to decrypt/re-encrypt are already know, again, reads some posts back.
Let's wait and see what gjoerulv will pull, i bet something great
strawberries... I actually skipped page 4 of this topic...
Anyway, most of what I said should hold true, the save format should remain mostly unchanged? Even if there is additional data (like achievements etc.), it should be placed at the beginning or end of the file. Any other way, ex. randomly adding pieces of data like so: O*ld*Da*ta*Som*eth*i*ng*OrO*th*er (* - is new data) would be illogical, and would require more work than it is worth.
The new file structure should be something like: NewDataOldDataNewData
Anyway, enough of my ranting, especially if what I say is wrong.
@gjoerulv: Is there any progress? Did you find anything in those files?
Edit: Didn't know there is a word filter here? Sorry about that.