Any file written by FunnelWeb. This includes listing, journal, product, and documentation files. (Warning: During most of FunnelWeb's development the term "output file" was also used to refer to what are now called "product files". This turned out to be extremely confusing and so the term "product file" was invented to distinguish the generic from the specific. However, as this was a late modification, you may find some occurrences of the old use of "output file".).