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.
You experienced a "save bricking" glitch or a power outage while playing. 3. How to Restore Your Backup ER0000.co2.bak
: You should see ER0000.co2 (your current mod save) and ER0000.co2.bak (the backup). 2. When to Use the .bak File The file is a backup of a save
