The WhatsApp online tools can be used to decrypt WhatsApp encrypted databases (*.crypt) and export the contents in a form of a *.zip archive.
Convert WhatsApp encrypted backup (original) to WinZIP Compressed ZIP archive.
We found one software available in the database for this conversion.
Articles and other information relating to crypt into zip conversion:
How to convert WhatsApp CRYPT files - Decrypting WhatsApp message databases
On-line services software - convert crypt to zip on web
Online service for WhatsApp databases
Convert from crypt file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.