Only one stupid idea. LJ3 - LaserJet III ?

>One of the C++ programmers I work with was attempting to change a report on and old, old program and found the report was printed through a routine that merged the data, contained in an array, with a file named 'NHMCOVER.LJ3'. The only documentation present said that the .LJ3 file came from a FoxPro report format. We have the valid FoxPro report but have no idea how it morphed itself into the .LJ3 file.