The Psion 5 has several built-in applications. They use their own file
formats to save data files. Psion has written file conversion
utilities for Windows 95, in the form of their PsiWin program. But
there are no conversion utilities for other operating systems. Also,
Psion is not able to or does not want to release enough data for
others to write their own conversion programs. At least, that is what
I have gathered through the newsgroups and from other sources.