.CRYPT9 File

The crypt9 file extension is likely only used by certain older versions WhatsApp Messenger, an instant messaging service and client for various mobile platforms.

The crypt9 file stores encrypted and protected database with chat history similar to SQLite database format. This file type seems to have been used briefly, only in particular beta version of Whatsapp.

WhatsApp Messenger also used crypt, crypt5, crypt6, crypt7, crypt8 file extensions for previous versions of its encrypted databases.

By default, the file is called: msgstore.db.crypt9 and is stored on phone SDcard/WhatsApp/Databases folder.

This crypt9 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Files with crypt9 file extension can be found as encrypted chat history databases from latest version of WhatsApp Messenger instant messaging client for Android, iOS, BlackBerry and Windows Phone

How to open:

You can restore crypt9 backups with the default function of the WhatsApp program. You may even transfer them to another device, provided it uses same telephone number.

How to convert:

Tools such as Omni-Crypt should be able to help you with exporting .crypt9 files to the original .crypt or WhatsApp .db format.