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>Also, if you create a simple program to run this app only (no SETs command), does the output get created?

This was a good idea, because it finally pinpointed the problem. The external utility was case-sensitive for file names; it would only take lower case. Of course ADIR() produces upper-case file names. Argghhh!!! Wasted a whole afternoon on this mess.

Thanks for your extra set of eyeballs; might have been another afternoon without them.