You shoul use Cipher50.FLL Cipher for VFP5 File #9222.

>I have just downloaded the cipher encryption program and somebody kindly explained how to set this up firstly by putting the following command in my main.prg:
>
>SET LIBRARY TO Cipher30.FLL
>
>when I do this and then run the main.prg to start the application I get the following error message:
>
>API library revision mismatch. Rebuild library.
>
>Can anybody tell me what the problem is. Many Thanks