I work in a daycare center for kids 3-6 yrs old. A couple times a week few of us adults take the kids to the local forest where we make a fire (I've got the kids using a firesteel and cotton/jp and they've gotten good at using them!) and use are Mora knives to widdle. In Denmark Moras are very common.
I always have my Leatherman Wave with me and have had to use the metal file on it to sharpen the Moras. Has anyone else used their file as a feild sharpener?