Files with cjd extension are used by Casio Ex-word. They store some various data.
CJD file extension - Casio Ex-word dictionary file
What is cjd file? How to open cjd files?
File type specification:
The cjd file extension is associated with the Casio Ex-word an electronic dictionary device that allows users to translate texts and forms to various languages. The .cjd file stores various data related to dictionary database. It is often used with customizing of a device.