dq_xi_s_saves_decrypt_v2.bms = BMS script for encrypting/decrypting saves. Currently set to decrypt full game saves (see comments)
quickbms_4gb_files.exe = Application for using above script
DQXISaveAnalysis.txt = Notes I took going through the differences between save files, mainly focusing on switchmakoto/data000.sav compared to gamepassmakoto/data000.sav. Kind of a mess.
2021gamepass = Saves made on 1/27 with the pc gamepass full version, using "Makoto" for the name, 3d mode, japanese voices, and defaults for the rest of the settings, with data000.sav being the initial save for slot 1, data001.sav being the initial save for slot 2, data008.sav being the initial save for slot 9, and data255.sav being the autosave for the latest created save (so slot 9)
2021steam = same as above but with the steam demo version
2021switch = same as above but with the switch full version
2021switchdemo = same as above but with the switch demo version
Gamepass Full Game = Save files with the same methodology as above (except for the slot 2 and 9 saves) but made in december with the gamepass full version
gamepassmakoto = The save files from Gamepass Full Game converted to their normal filenames
Steam Demo = Saves from the steam demo not following the above methodology (using Rinka for the name instead)
steammakoto = Saves from the steam demo following the above methodolgy (minus slot 2 and 9 saves) made a few days after gamepassmakoto 
Switch Full Game = My personal saves from the switch version, most of which are hundreds of hours in, representative of the type of save that would actually be being converted.
switchmakoto = Saves from the switch full game following the above methodolgy (minus slot 2 and 9 saves) made a few days after gamepassmakoto 

The _decrypted version of the save files are all made using the BMS script, to make things easier.