I know I'm late to this party, but just in caseā¦
I cracked the PS4 version open today, and can confirm that it is running what appears to be a very slightly modified version of the original ROM. I can't tell exactly what the modification is doing, but it appears to inject some code at the end, and updates some references along the way.
I can tell you that the images, players stats, etc. are not in the ROM, but are instead injected in realtime through the emulation layer. I am not sure what this method is called, but I believe it is the same method used by Nintendo, among others, for this kind of thing.
While the file size is ~250 megs, it ZIPs to ~10 megs. Most of the file size is some UI texture files, which I have not yet been able to decrypt, but seem to be in some kind of bitmap type encoding, as they compress with simple ZIP at a rate of ~99%. Player data, Line combinations, and even Team Jersey colours are stored in CSV files, and most graphics are stored as GNF files. The total injected data is only 2.5 megs uncompressed, to the original 1.0 meg ROM format.
I haven't been able to identify what Emulator they are using, but from what I can tell, I don't see any of our communities mods or code in here, but I can't be sure. FYI the executable boot.bin is ~7 megs.
OK, I'll stop now. I've tried to answer some unanswered questions tin this thread, but at this point I'm just geeking out.
Will attach some reports in case anyone is interested in this kind of stuff. And again, my apologies if this is all old news, I haven't had the time to read everything Rewind related here, I just felt compelled to crack Rewind on the PS4 today, to see what I could see.
Image0.csv
Side-by-Side.html Summary.html Interleaved.html