Psion 5mx PDA Compatability with Mac OS X - Reading Psion Files

Hi - anyone know how to read Psion PDA files on a newer Mac? I think I can get them onto the mac with my card reader. However, after that I am stuck with something I cannot read or print from which is very frustrating as I use the Psion almost as much as the Mac (and entirely so when I am on the move or in my boat).

Any help much appreciated - I am sure there must be a was and that someone out there knows the answer! - John