If you're playing on Steam, follow these steps:
: Open Prototype 2 and minimize it using Alt + Tab . Open Task Manager : Press Ctrl + Shift + Esc .
If you have tried everything else—reinstalling, running as admin, or disabling antivirus—this user-verified method from a Reddit thread has proven successful where others fail.
“Failed to save data. The data may be corrupted.” Cause: The game cannot write to its save folder ( Documents/Activision/Prototype 2/ ). Common reasons include:
: Some users find that creating a fresh Local Windows User Account with Administrator rights bypasses corrupt profile permissions and OneDrive interference. prototype 2 failed to save data fix exclusive
Turn off , OR click Allow an app through Controlled folder access and add prototype2.exe . Additional Troubleshooting Tips
: In the same Compatibility tab, click "Change settings for all users" at the bottom and check "Run this program as an administrator" again there to ensure the setting sticks.
Locate the game's executable file ( prototype2.exe ). If you use Steam, right-click Prototype 2 in your Library, select , and click Browse local files . Right-click prototype2.exe and select Properties . Navigate to the Compatibility tab.
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. If you're playing on Steam, follow these steps:
Fix 1: Configure Windows Controlled Folder Access (Recommended)
Prototype 2, developed by Radical Entertainment and published by Activision, was released in 2012 to mixed reviews. While the game received praise for its improved gameplay mechanics and open-world design, many players encountered technical issues, including the "failed to save data" error. This problem occurs when the game is unable to save your progress, resulting in lost data and a frustrating experience.
Locate your save folder, typically found at: C:\Users\[Your Username]\Documents\Activision\Prototype 2\ Right-click the Prototype 2 folder and select . Under the General tab, uncheck the Read-only attribute.
: Add the game as an exception or temporarily disable this feature. Steps : “Failed to save data
Windows Defender often blocks the game from writing files to your "Documents" folder. Windows Security Virus & threat protection Manage ransomware protection Controlled folder access Alternative: Keep it on but click
General permission issues can prevent the game from creating the necessary save directory.
: Go to Documents\Activision\Prototype 2 . Right-click the folder, select Properties , and ensure the "Read-only" attribute is unchecked. 2. Windows Security & OneDrive Conflicts