Add the entire Prototype 2 installation folder to the exclusion list.
Prototype 2 was coded for older file architectures. Often, the game fails to automatically create its required save folder upon installation. Creating it manually usually bypasses the error immediately. Press Windows Key + E to open File Explorer.
: Click on the Allow an app through Controlled folder access link. prototype 2 failed to save data fix
Locate the cloud icon in your taskbar, enter settings, and while playing.
This isn't a Prototype 2 problem; it’s a . We, the players, are now the archivists. We have to manually adjust the security of our own machines to allow a classic to keep running. Add the entire Prototype 2 installation folder to
try const res = await fetch('/api/proto2', method: 'POST', headers: 'Content-Type': 'application/json' , body: JSON.stringify(payload) ); if (!res.ok) const err = await res.text(); throw new Error(`Save failed: $res.status $err`);
Right-click on prototype2.exe and select Properties . Step 3: Click on the Compatibility tab. Creating it manually usually bypasses the error immediately
Use this quick reference table to make sure your system matches the game's expected pathways and behaviors: Setting Element Expected Configuration Baseline C:\Users\YourUsername\Documents\Activision\Prototype 2 Stores local game data. Executable Rights Enabled (Run as Administrator) Allows directory creation. Folder Security Status Exception added to Controlled Folder Access Stops anti-ransomware blocks. Storage Flag Read-only attribute cleared Permits real-time save updates.
Right-click the file and open its Properties window. Navigate to the Compatibility sub-tab. Check the box to Run this program as an administrator .