Under the tab, check the box for Run this program as an administrator .
Your security software might be blocking Prototype 2 from writing save data. This is a common but often overlooked cause.
Windows may be blocking the game from writing to your Documents folder as a security measure.
Here is a comprehensive guide to fixing the "Prototype 2 failed to save data" error, ordered from the simplest to the most advanced solutions. 1. Run the Game as Administrator prototype 2 failed to save data fix
Launch the game and attempt to save your data.
The game expects saves in:
The root cause of this error boils down to and incompatible background cloud services . Under the tab, check the box for Run
Prototype 2 Failed to Save Data Fix: Comprehensive Solutions
This prevents crash issues related to multi-core processors.
Look for the folder named (or Prototype 2 directly, depending on your version). Right-click the folder and select Properties . Uncheck the Read-only box at the bottom of the General tab. Switch to the Security tab and click Edit . Select your Windows user profile from the list. Ensure Full control is checked under the "Allow" column. Click Apply and OK . 5. Verify Integrity of Game Files (Steam) Windows may be blocking the game from writing
Select and browse to your Prototype 2 installation folder (usually C:\Program Files (x86)\Steam\steamapps\common\Prototype 2 ). Select prototype2.exe to whitelist it. 2. Disable OneDrive Syncing
Some users report the legit Steam version has a save bug; applying the save fix from an older “NoDVD” release (just the steam_api.dll and save folder structure) resolves it. This is technically a crack, so only do this if you own the game legally and accept the risks.
Alternative: If you do not want to use this feature, you can temporarily toggle Controlled Folder Access to while playing. 3. Change the Compatibility Mode
Corrupted game installation files can break core subroutines, including the auto-save trigger scripts.