If you use Microsoft OneDrive, your Documents folder might be constantly syncing to the cloud. This sync process can lock the Prototype 2 save files at the exact millisecond the game tries to modify them, resulting in a failed save message.
Move the game from an external drive to your main C: drive.
Prototype 2 is a masterpiece of open-world destruction, but on modern PC systems, it is notorious for being a broken, unoptimized mess. One of the most heartbreaking issues players face is the . You spend hours tearing through New York Zero, only to realize your progress has vanished because the game cannot create a save slot.
The folder will contain your save files ( slot-A.bin , slot-B.bin , etc.) and a profile.bin file that stores your game settings. prototype 2 failed to save data fix exclusive
Follow these methods in order. Start with the most common culprit: Windows Defender. 1. Allow Prototype 2 Through Controlled Folder Access
Exclusive Fix 2: Run as Administrator and Configure Security
Add prototype2.exe to the allowed list to permit it to write save files to your Documents folder. : The game often fails when running on more than 4 CPU cores. If you use Microsoft OneDrive, your Documents folder
If you are trying to save while playing the or with DLC unlocked, the game requires your Steam ID to be present in a specific config file. If this file is missing the ID, the save fails.
Under , click Allow an app through Controlled folder access .
Design options
Right-click prototype2.exe in your Steam library files and select .
Here are the exclusive fixes to get you back into the action.