I hope your assistant is wrapped up nice and warm!
I downloaded preview-extractor and it sure works. Looking at the end of RIAT the 'mileage' on my D2X was approx 13500 some 400 higher than the filename I set to consecutive after a few hours of ownership.
My fathers D70 had taken an amazing 600 I reckon 150 of those were from me!
This little utility is going to come in handy