The built-in Windows Defender Ransomware Protection often stops the game from creating save files in your Documents folder. Open the Windows and type Windows Security . Click on Virus & threat protection . Scroll down and click on Manage ransomware protection .
Once the fix works, you should see files like savegame0.sav inside Documents\Activision\Prototype2\SaveGames\ . Test by playing for 10 minutes, saving manually, then restarting the game.
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Windows Defender may block the game from writing to your Documents. Search for "Controlled folder access" in the Windows Start menu and add prototype2.exe to the allowed apps list. Check Folder Permissions: Navigate to C:\Users\[YourName]\Documents\Activision . Right-click the Prototype 2 folder, select Properties , and ensure "Read-only" is unchecked. Steam Community Advanced "Exclusive" Troubleshooting
Immediately go to a save point in-game to ensure it writes the new file. 🛠️ Additional Technical Fixes 1. Run as Administrator Scroll down and click on Manage ransomware protection
On newer processors, having more than 4 or 8 cores can cause various glitches, including save failures. , and hit Enter. Advanced options Number of processors and select Restart your PC and try saving again. Save File Locations
Steam Default: C:\Program Files (x86)\Steam\steamapps\common\Prototype 2\ Select prototype2.exe and click . Restart your PC and launch the game through Steam. Fix 2: Uncheck the "Read-Only" Attribute on the Save Folder user wants a long article about fixing the
: Right-click prototype2.exe and select Properties . Change settings : Navigate to the Compatibility tab.
Launch the game and allow it to recreate the directory structure from scratch. Fix 5: Steam Cloud Conflicts
| Generic Suggestion | Why It Doesn’t Work Here | |--------------------|--------------------------| | Run as Administrator | The game uses two save paths; admin fixes only one. | | Verify game files | Save corruption is not file integrity related. | | Reinstall game | The save folder structure is not recreated by reinstall. | | Disable antivirus | The issue is UAC/Controlled Folder Access, not real-time scanning. |
: Use the "Prototype2Fix" mod or a custom batch file to automatically limit the game to 4 or 8 cores upon launch. How to fix and play Prototype 2 on PC in 2025