As part of the upgrade, we'd like to change all program defined files to
externally defined files. Unfortunately, the file SALES doesn't exist so
compiles would fail. I could change them all to SALES2012, but at some
point this file won't exist either. I can create an empty file named SALES
with the same layout and no records, but this still has it's problems
(there are many programs where the file is defined more then once, SALES1
and SALES2, for summary processing).