Are you able to open .vcx file as a table? If so, copy it to test.vcx. Usally test.vcx/vct contain all original information.
If you have exe file containing this cklasslib, I could try to recover it from there.

>I need to recover some corrupted .vct files. When trying to COMPILE CLASSLIB I >get a message "Memo file is missing or invalid".
>Please advise.