Adding 300 + files via the 'SWF File' button / file import dialogue crashes the runtime.
This is a bug with the Air runtime which I have (sadly) not yet been able to find a
work around for.
Fix: drag and drop the files on SWF Renderer instead.
This has been tested with 11,300 files, which took a little time but worked as expected
Another fix: use the command line to batch the files in, however in most of these cases drag and
drop should work fine