Actually it can be made to work by double clicking of the jar file if you make the Manifest.mf file like this...

Main-Class: phex.f
Class-Path: crimson.jar jaxp.jar xalan.jar

I think the proper syntax is to simply have spaces seperating the classes. Some one should give this a try (unzip it, change the manifest file and rezip it), I already have the libraries installed, and so it would not make a diffrence for me, I could probably remove the libraries to test it. I'll do that...