I agree, it 'looks' like a file...but, all the files I've owned (4 or 5) are slightly tapered like your pic but have a 'square' end opposite the smooth pointed end. Yours seems to taper to a pt. Can't tell from your pics...does one (or both) edge(s) appear to be sharpened...or, are they flat (w/o an edge)? Finally, I would think that if it is a file...some rust could be 'bumped' off by striking it with the handle of a large screw driver and thereby reveal some evidence of the machining to produce the file. GL and HH!