Wsappbak

Saving apps that have been removed from the Microsoft Store. App Portability:

If the wsappbak file is corrupted or uses an older encryption method (crypt7, crypt8, crypt10), WhatsApp will fail to restore it and may create a new empty database. wsappbak

Users frequently encounter "This application could not be started" errors if the installation guide—which typically involves extracting to the system drive and running the package installer—is not followed exactly. Administrative Barriers: Saving apps that have been removed from the Microsoft Store