So, I'm gonna try and get into great detail when I first decided to replay the game because of Remake coming out, so maybe that'll help.
Some months back, I decided to get through the game and always heard about The Reunion being one of the easiest mods to install, especially if you want the re-translation, so I got, at the time, r05c and played it with zero problems, but what's catching me off guard about what you guys are saying with the tiny window coming up, I never had that at all. It loaded the game just fine, as if it was the Steam version with the mod installed: it loaded up with the window size I chose from the launcher on Steam, it recognized my controller that I was using, gave me the prompt before going to the New Game/Continue? screen about what keys did what, Hit X to get to that screen, and it all just worked fine. I also had Steam achievements working, so for me, it just seemed like it was working fine and as intended (from my experience after installing/uninstalling parts from that version. After that, I installed r06c and, yeah, still ran the game as I normally would without any of the "issues" that I'm currently having. I didn't even open up an .ini file to
After that, I waited for 7th Heaven 2.0 and just saw that it was much easier to use, so I got the Remako download files from ModDB, through them into 7th Heaven 2.0 and realized, you know what? This is gonna take up too much space after installing just one of them, so I said screw it and got rid of it. Uninstalled that, got rid of 7th Heaven 2.0, uninstalled the game, and just redownloaded it. Then, reinstalled r06c of The Reunion, and that's when I started to see how it would only launch in the tiny window, could only use my NumPad to select things from the title screen, and how it no longer was detecting my save. It didn't make sense for me since I never had this happen before, so it kinda is catching me off-guard that this is how it's "intended" to work when that's how I never had it work before.
I did however got my save to be detected to see, but one thing I did notice that when my game loaded up, the World Map/Field View or whatever it's called is in higher-res than ever before. I went into the .ini settings to see, but that setting is turned off to begin with, so that's another things that I noticed when I last checked it.
So yeah, that's where I'm at and trying to figure out how to get it back to when I first played it months ago. I hope I cleared it up a bit for you guys. Sorry if this is a head scratcher for you all, but I'm just confused as you are :/