C:\Program Files (x86)\Steam\userdata\[YourSteamID]\250900\remote\ Note: "250900" is Steam’s App ID for The Binding of Isaac: Rebirth (which holds Repentance data).
A: Yes. The save structure remains identical. Your co-op partners will see all your unlocked characters. Conclusion: Embrace the Full Isaac Experience The Binding of Isaac: Repentance is a masterpiece of reactive difficulty, but it is also a game that respects your time less than any other in the genre. There is no shame in using a 100% save file download to bypass the 900-hour slog, especially if you’ve already beaten previous versions (Rebirth, Afterbirth, Afterbirth+). The Binding Of Isaac Repentance 100 Save File Download
Isaac is a single-player game. Using a 100% save file does not affect leaderboards (there are none), violate any EULA (End User License Agreement), or harm other players’ experiences. Many veterans use save files to test mods, speedrun specific bosses, or recover lost progress. It is not considered cheating by the developer—Edmund McMillen has even joked about "save file sharing" being a form of community mercy. Your co-op partners will see all your unlocked characters
/home/deck/.local/share/Steam/steamapps/compatdata/250900/pfx/drive_c/users/steamuser/Documents/My Games/Binding of Isaac Repentance/ Isaac is a single-player game
A: Generally, no. Console save files are encrypted and tied to your profile. There are unofficial homebrew methods (jailbroken Switch only), but they risk a ban. PC only for safe use.
Back up your original saves, disable Steam Cloud temporarily, and only download from trusted community sources.