Okay seems there's some huge 26 meg UWP application. the english exe and jp exe are hidden at
ff7\resources\ff7_1.02
without their exe extensions. they don't seem to actually run, though, wanting some files that are not at all present in this release. it seems the 26 meg wrapper deals with this.
I'm not sure this version can even be converted. it does have a nice shiny japanese ver exe hidden in it though.
it does seem to have xbox AND ps4 controllers natively supported, with button prompts. a nice trick. and if course it has the ogg music, and the new cheats. (3x speed, no encounters, insta limit break, dialog skip)
the button prompt thing and the new cheats are the most interesting feature i think.
Replacing data files with modded versions should still work. So mods that don't touch the exe should be installable.