Are you talking about the files/images created by PaperPort? I don't know about converting them but there is a free MAX viewer:
Has anybody roduced a simple converter that will change *.max files into *.jpeg or indeed any format?
I have found various solutions suggesting purchasing software (expensive) or printscreen (messy) or even asking people to re-send (impossible), none of which really address the question.
Surely someone will have beavered away in their lunch hour to produce a simple freeware solution?