InfoPath Dev

 Hi Patrick,  thanks for your answer. In the meantime I discovered that the error only occurs if I open the xsn over ist Context Menu ->Design. If I first open the InfoPath Designer and open it using the open dialog, it works for me. Although I still don't know why opening using the context menu suddenly fails, this Workaround ...

 Hello! When I try to open a InfoPath xsn Form Template I get the following error: "InfoPath cannot open a new form. The form template is trying to access files and settings on your computer. InfoPath cannot grant access to these files and settings because the form template is not fully trusted. For a form to run with full trust, ...