In this case the .wpf files are from a word processing program called "Enable". I believe the original makers of the program was called "The Software Group". The word processing program was a part of a suite of programs that came in a bundle format. Word processing, spreadsheet, early communication type program, and I think maybe a data base program. Kind of like a early version of MS office. Was out either in the late 70's through the early 90's if I remember correctly. I know it was used an extensively by the US Army JAG for a few years. Was out about the same time as Multimate word processing program and early versions of Word Perfect. There were, I believe, several versions of Enable. Something like Version 1, 2, 3, and I think OA.