book on it, (the "users manual") it was produced by SPC (Software Publishing Company). Is that not the same PFS?
I don't mind switching him to another product but I don't know what that would be.
Are you sure it wasn't produced by SPC - Software Publishing Corporation?
http://www.business.com/directory/computers_and_software/software_applications/software_publishing_corporation/profile/I have found links referring to PFS: Professional File 2 - which is a file management application written by SPC (as above).
Nothing to do with PFS - Professional File System written by Michiel Pelt.
The link I provided gives some contact details for SPC - perhaps it is worth contacting them to see if they still support the product (although it was published in 1988)?
EDIT: PFS in the case of SPC software (including Professional File ver 2.0) appears to stand for "Personal Filing System", and was a range of productivity software which included titles such as PFS:Write, PFS:Access, and PFS:File, etc.
As opposed to the Amiga PFS which, as stated above, stands for "Professional File System", and is a hard-disk format, analogous to NTFS or FAT (although, of course, far superior ;-P ).
Good luck in getting your friends machine up and running.
Regards
Rich