David, thanks for the reply.

>...I'm not sure why you are testing to see if the prg exists...<
It's a safety measure. Some programs are called via macro subsitution, and therefore not automatically pulled into the project. I wanted to display a user-friendly message rather than have the app 'fall-over' if the program did not exist.

>In your runtime I think you need to test for the existence of the FXP instead of the PRG.<
That does the trick! Many thanks.

Regards,
Alan