I am wondering why I am unable to simply point to a file on the USB drive to load into my local swf?

I have mywidget.swf and a config.xml file at the same level (root) of the USB drive, yet flash refuses to load it.  What is the secret?

Got all the debugchumby set up, etc.  I am using loadXML to load it.  I have tried "config.xml", "./config.xml", "/config.xml", "/mnt/usb/config.xml", and "mnt/usb/config.xml"

Thanks in advance.