Lowell,
Interesting video. However I see two major flaws in using a file to sharpen a tanged shave cutter. The first is it would leave too rough a face, That could be fixed on stones but if that is the case why not start there. The other is holding the work while using a file. Even if you figured out how to hold the cutter the tange would get in the way of filing the full bevel end to end. I would guess you could make it work but I think there are easier and better ways.
ken