Right-click the OneDrive icon in your taskbar and select Pause syncing before launching the game.
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For players returning to Prototype 2 , the "failed to save data" error is a notorious hurdle that stems from modern Windows security features and the game’s dated architecture. This issue typically arises because modern operating systems block the game's ability to write to the Documents folder or because of conflicts with high-core-count CPUs and cloud syncing. Right-click the OneDrive icon in your taskbar and
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Note: The hex code FFFF restricts the engine to 4 physical cores, preventing threading overflows that result in sudden desktop crashes. Resolving Severe Frame Rate Drops
Real-time protection can block the game from writing .sav files.
: In the General tab, toggle the switch for Keep games saves in the Steam Cloud to Off .