After reviewing post #13, the back of the blade is odd. There are three rows not one or two as for a saw back. The is no set to the teeth to clear chips. So, I don't think it is a saw.
The teeth are not raised in one direction having been cut in like a rasp, but omnidirectional like a bastard file. While it could be a file, what was it made to file? Horses' hooves? A jittery horse and a sharp hunting knife seem like a recipe for disaster. Also, files are usually fully hardened and brittle to prevent wear. To me it seems to be very aggressive decorative knurling more than anything else.
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