For many users, wsappbak appears as an unfamiliar extension or a search result when troubleshooting backup issues. Is it a virus? A corrupt database? Or something essential for your chat history?
Uninstall WhatsApp completely, then reinstall it from the Play Store. When prompted to restore from Google Drive, skip that option. Instead, WhatsApp should automatically detect the local msgstore.db.crypt12 file and offer to restore it.
Leo looked at the vial, then at the rain lashing against the window. He thought of his empty apartment, his cold screens, his aching back.