Er0000.co2.bak Apr 2026

: You should see ER0000.co2 (your current mod save) and ER0000.co2.bak (the backup). 2. When to Use the .bak File

the game using the Seamless Co-op launcher. Your previous save state should now be active. 4. Pro-Tip: Converting Vanilla Saves ER0000.co2.bak

: Inside, you'll see a folder named with a long string of numbers (your Steam ID). Open it. : You should see ER0000

: Press Win + R , type %appdata% , and navigate to Roaming > EldenRing . ER0000.co2.bak

The file is a backup of a save file for the Elden Ring Seamless Co-op mod . In Elden Ring, standard save files use the extension .sl2 , but this popular mod uses .co2 to separate modded progress from the vanilla game.