This is why I chose my words carefully, and used the word "disciplined" rather than "difficult". What could be easier than filing, you just punch the paper and put it in the right place in the file. Why student don't, do this is because it is a very disciplined task. It is an easy task but has to be done right again and again. When I wrote my reply I didn't have a lot of time, Revel perfectly described the scenario that I probably should have given as an example.I don't see why handouts would be difficult to file. A three-hole punch and a binder handle a lot of it. I tell my students they need a binder for my class. It's a cheap class because they don't buy a book, so they can spend for the binder
Laurie, I'm interested that you suggest three hole files. They don't seem to be available in most of Europe. In Europe, students either use two-ring binders or (Aaragh

If you are able to ensure that students file their work well, I'd love to know how. When I was younger, I actually failed courses because of my inability to file well. I suspect that I'm not the only one.
Incidentally, one problem of kinesthetic techniques is that they may make filing more difficult. One should always make sure that one gives the students time to file.