When having opened a pdf File without any extension (wich is possible via the openDocument() method, i use)
I'll get a StringIndexOutOfBoundsException at the "Save As" Action

Exception in thread "AWT-EventQueue-0" ]
java.lang.StringIndexOutOfBoundsException: String index out of range: -2
        at java.lang.String.substring(String.java:1938)
        at org.icepdf.ri.common.SwingController.generateNewSaveName(SwingController.java:2234)
        at org.icepdf.ri.common.SwingController.saveFile(SwingController.java:2150)
        at org.icepdf.ri.common.SwingController$9.run(SwingController.java:3252)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)]
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

I'll attach a small patch later.