I’ve seen the posts about wood rasps and always think of the pile of old files and rasps I have stored in boxes around my house. I was wondering if they could be cleaned up and sharpened so I asked Google. One of the first responses listed was this Popular Woodworking blog post from Christopher Schwarz dated 10-24-2007:
I’ve seen old files turned into various types of knives. On the top of the blade you can still see the file teeth resulting in a neat looking blade. You can shape the blanks yourself if you have the right equipment. Google turns up a lot of knife makers that use old files and instructions on how to make knives yourself. There is also a guy in Memphis, TN that sells a ton of exotic burl blanks for those type of projects. Something to consider I guess.