Years ago I began scanning my "important" documents using Pagis, software that came with my HP Scanner. Eventually I began to scan to PDF (as the scanner software became able), but I still had many old XIF file. The Pagis software would run only on 32 bit OS (Windows) which is now becoming less and less common. In fact I have a Win32 system I've kept alive just to retain access to the XIF files.
I can convert these files using Adobe Acrobat (or equivalent) "simply" by opening the XIF viewer, then printing the doc to the Adobe PDF "printer". Unfortunately I have enough files that this manual process would take many years.
So, what's the best way to convert a large number of XIF files to PDF?