Thanks for your comment.
I'm using Internet sites, too and they don't cause any problems.
The problem which I also encountered with XPiNC is the usage of the OpenNTF Domino API. I was not able to solve this so I decided to refactor all the Java code that uses it and deactivate the usage also in the XSP properties. So if you deep dive into the Java code you want to replace all occurances of
class. After that you can deactivate the Usage of the API in the XSP properties. Then you should be able to use FileSilo in XPiNC. That's an issue I may discuss with the guys from that great project, but until then my workaround does it, too.
Next release will have this out of the box.