Back up the C:\Windows\WinSxS\Manifests folder. If corruption occurs, compare manifests with a known-good system. Tools like sigcheck from Sysinternals can verify digital signatures.

By following these best practices and understanding the role of SxSi on your x64 Windows 10 system, you can optimize your system's performance and stability.

: If your hardware supports it, Microsoft strongly suggests upgrading to Windows 11 to ensure continued protection and feature updates. Windows 10 system requirements - Microsoft Support

Why Does an Updated Windows 10 x64 System Have a Large WinSxS Folder?

Windows stores the actual system file in the WinSxS directory and creates a "hard link" pointer to it in other folders, like C:\Windows\System32 . Windows Explorer counts the file size in both locations, meaning the reported size of WinSxS is often double its actual physical footprint on your hard drive.