In Panorama 6, is there anything that would throw a "File not found" error other than trying to open a file? Maybe looking for a dictionary?
The fileload( function will give that error if the file doesn't exist. I'm not sure if that falls under your "other than trying to open a file" category.
There is nothing related to a dictionary that will result in that error.
Trying to do a FileSave in a folder where you don't have permission will do it.