Launch the game and attempt to save your data.
Click . A prompt will appear; choose Apply changes to this folder, subfolders and files and click OK . Verifying the Fix
The error is frustrating but almost always fixable. Start with Run as Administrator and Controlled Folder Access —these solve 80% of cases. For stubborn issues, permissions and compatibility mode will do the trick.
If the operating system locked your local directory to a strict "read-only" state, the game code cannot save your campaign progress or settings adjustments. prototype 2 failed to save data fix
Look for a folder named . If it does not exist, right-click, select New > Folder , and name it Activision .
Click , select Folder , and choose the main Prototype 2 installation folder. Disable Steam Cloud Synchronization
The game may not create the folder correctly. Launch the game and attempt to save your data
The most common reason Prototype 2 fails to save data is a lack of write permissions. Modern Windows security protocols often block older games from modifying files inside the Documents directory. Giving the game administrative privileges usually resolves this instantly.
Note: If the game was purchased via Steam, users should verify the integrity of game files via the Steam Client (Properties > Installed Files > Verify Integrity) to force Steam to reinstall missing dependencies.
Uncheck the box next to .
Click Apply and then OK . Launch the game directly from the folder or via Steam to see if it saves. 2. Configure Windows Defender / Controlled Folder Access
Look for a file named display.ini . If it does not exist, create it. Open it with Notepad and ensure it contains the following: