The CFF file extension is related to the CA Clipper and used for its workbench application files.
CEF file extension - CA Clipper workbench application file
What is cef file? How to open cef files?
File type specification:
The CEF file extension is used by Clipper a computer programming language that is used to create software programs that originally operated primarily under DOS.
Although it is a powerful general-purpose programming language, it was primarily used to create database/business programs
A *.cef file used in CA clipper contains workbench data.