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Prototype 2 needs explicit permission to write to your protected "Documents" folder.
Navigate to your Prototype 2 installation folder (e.g., SteamLibrary\steamapps\common\Prototype 2 ). Right-click on Prototype2.exe . Select -> Compatibility . Check Run this program as an administrator . 2. Disable Cloud Saves (Temporary)
: Right-click prototype2.exe , go to Properties > Compatibility , and check "Run this program as an administrator". prototype 2 failed to save data fix exclusive
Back up your registry before doing this.
This is the most common reason for the "Failed to Save Data" error on Windows 10/11. Windows Defender protects your documents from unauthorized changes, but it incorrectly flags Prototype 2 . Open the app.
If you previously installed or modded Prototype 1 or Prototype 2, corrupted or read-only legacy system files might block new data blocks from being written. This public link is valid for 7 days
After the process completes, launch the game. This background-level fix is often the only solution for stubborn, persistent save issues.
Which are you currently running (Windows 10 or 11)?
: Press the Windows Key, type Windows Security , and press Enter. Can’t copy the link right now
If OneDrive backs up your Documents folder, it may lock the save file.
Follow this ordered checklist to systematically resolve the issue: