I have released a new version of WhatsApp Viewer, get it here:
Thanks to TripCode, who released source code to decrypt the crypt12 file format:
See details about the format here:
- How to Decrypt WhatsApp crypt12 Database Messages
- gitlab.com digitalinternals
- Post on XDA by TripCode
Additionally, WhatsApp Viewer now supports exporting a chat to a .json file. Thumbnails of images are stored as base64.