I managed to get the whole application running and I transformed an xml - xsl pair that was produced by wh2fo via fo to pdf. And that was fun, I like the concept of the program. The only thing in the menu that I don't understand is the Document Preview option.
When I click on it I get this message: No preview documents availlable: Generate Preview.
When I generate a preview I see the source xml in the IE explorer but that won't change the reaction of the program after I choose Document Preview.
So my question is: How can I use Document Preview?
I found it.
Generate Preview made a call to the pdfViewer.bat instead of to the preview.bat. After changing that, it works fine.