This folder serves as a for Windows Store (now Microsoft Store) applications. When Windows updates a built-in app (like Calculator, Mail, Camera, or Microsoft Store itself), it first backs up the existing version of that app into the wsappbak folder. If the new update fails or causes system instability, Windows can roll back to the previous, stable version using this backup.
: To use the resulting backup, you typically need to install the wsappbak
If permission errors persist:
The user identifies the specific folder of the app they wish to back up (e.g., C:\Program Files\WindowsApps\Microsoft.ZuneVideo... ). This folder serves as a for Windows Store
Reinstalling Metro apps on Windows 8.1 after official servers have been shut down. or Microsoft Store itself)