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Lots of people have used old files for knives and razors, it works just fine but...they are so hard that they need to be annealed first. Be sure to use a file that is thick enough, 1/4" after...

Wow! That guy was really smart....I have lots of small knives and razors!:D

Take a piece of steel 1/4" thick x1" wide and 7" long
use 1084,1095 or O1 steel
anneal the steel
draw a patten of the razor on the steel
drill the pivot pin hole in the tang
cut/grind/ sand away...