Open CO2 files in your browser
The save of Elden Ring's Seamless Co-op mod, an Elden Ring save under another name. Open one right here to see every character in it, without the game. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your file opens on a page of its own, with what it holds in plain words.
- What it holds • In plain words, from the file itself
- What's locked • Said plainly, never decrypted
- Nothing in it runs
- Read, never changed
About CO2
Elden Ring keeps its saves in ER0000.sl2, ten character slots in one file. Seamless Co-op, the mod that lets friends play the whole game together, keeps its own in ER0000.co2, so the game's own save stays untouched.
Both are BND4 containers of twelve entries: the ten character slots, a profile and one more block, each checked with MD5 and, on PC, not encrypted. The profile gives each used slot's name, level and play time, and each slot its class, its attributes and its runes.
Filepeek reads the profile and the slots into a page with every character's name, level, class, play time and the runes they hold and have gathered, and checks each slot's MD5.
Elden Ring Seamless Co-op save
.co2 • .sl2
Format
- MIME type
- application/octet-stream
- Made by
- FromSoftware, renamed by Seamless Co-op
Inside the file
- Container
- BND4, twelve entries
- Characters
- Ten slots
- Checks
- An MD5 for each slot
- Encryption
- None on PC
Opens in every browser
No browser opens a CO2: they download it. Filepeek reads it in Chrome, Edge, Firefox and Safari.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Questions
How do I see the characters in an Elden Ring save?
Drop ER0000.sl2 or ER0000.co2 on this page, or choose Peek a CO2. Its page lists every character with its name, level, class, play time and runes.
What's the difference between .sl2 and .co2?
None inside. Seamless Co-op saves to .co2 so the game's own .sl2 stays as it was, and both open the same way.
Does it change my save?
No. Filepeek only reads it, and it never leaves your device.
Does it open Dark Souls saves?
No. Dark Souls III and FromSoftware's other games encrypt their saves with a key of the game, which Filepeek doesn't carry.