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If you are gaming on Linux or Steam Deck, the save directory behaves differently. You may need to copy saves from the compatdata directory into the pfx/drive_c path. If the Modlist Save Game directory fails, check the prefix directory (Steam Play compatdata).
Under , click Allow an app through Controlled folder access . prototype 2 failed to save data fix exclusive
The community-developed Prototype 2 Fix mod on or Nexus Mods can resolve multiple stability issues, including save errors and resolution bugs, by modifying the game's internal .ini files. Failed to save data message preventing play
If you have tried everything and the game still refuses to save, run through this checklist: This public link is valid for 7 days
Right-click prototype2.exe and select Set affinity .
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. Can’t copy the link right now
CPUs with 8+ cores (or 16+ threads) confuse the game engine, causing it to fail on file input/output operations.
🚀 Exclusive Fix: The "Save Data/Corrupt Slot" Method (2026)
Uncheck all cores, then check only CPUs 0 through 7 (limit it to 8 threads).
Below is a comprehensive guide to the most effective "exclusive" fixes to restore your ability to save progress. 1. Configure Controlled Folder Access
