WhatApp Tri-Crypt app for Google Android phones can be used as a background process to convert CRYPT7, CRYPT6 and CRYPT5 encrypted archives to the original legacy CRYPT format. After that, plenty of programs can be used to decrypt and extract the original CRYPT format, the most popular being program the Whatsapp Xtract.
Open CRYPT6 file Open CRYPT fileOnline service for WhatsApp databases