No specific info about version 3.1. Please visit the main page of Enolsoft XPS Viewer on Mac Informer.
Note: This is no longer an actively developed application.
This program is a simple yet capable EPUB reader for Mac.
Winmail Viewer allows you to open and view winmail.dat files.
Helps Mac users to easily and quickly view CHM files on a Mactonish.
It is designed to convert XPS and OXPS files into PDF documents quickly.