According to my dBase IV book:
Open dBase
Issue the following commands:
SET ENCRYPTION OFF
USE <tablename>
COPY TO <newtable>
where <tablename> is the encrypted data table, and <newtable> is another database name which will be unencrypted. It does not address the .cpt memo field file, but one must assume it also gets created.
As an alternative, it appears from the book that the following should also work:
RENAME tablename.CRP TO tablename.DBF
RENAME tablename.CPT TO tablename.DBT
after making backup copies of course in case something gets mucked up. I've not worked with encrypted dBase files before so I'm only drawing from a resource book I have.
Hope this helps.
dennis