I should have gotten around to this some time ago,but yesterday I had the occasion of using the HF file I bought several months ago.
Sorry to say,though the bastard cut file looked o.k.,it just filed like it was worn out rather than like a sharp new file. I haven't looked at the teeth under a microscope,but I think maybe the teeth have been bent back too much during cutting them.
Regardless of the problem,the file just did not file mild steel well. I will not buy any more of them.
At some point,I will try the Kobalt files that Lowes sells. But don't hold your breath!! I move slowly these days.