It is likely that no crypt12 to word conversion is possible. Nevertheless, many users are looking for a way to extract or convert WhatsApp chat history from .crypt12 backups and save them for example as Microsoft Word document (.docx file extension).
This is doable, but requires to use several tools to achieve this. First, you will need to convert crypt12 to crypt and then use the WhatCrypt Tools to export the message history. The default output is HTML, but you can easily turn that into Microsoft Word document (.docx).Open CRYPT12 file Open WORD file
Online service for WhatsApp databases