Likewise.
They seem no longer manufactured, and the nearest available now, at least easily, is the abrasive type intended for cutting ceramic tiles, and a lot shorter than the original Abrafile.
I have not experimented with cutting metals with them. They may be all right on steel. may be fine on harder steel like gauge-plate and might even cope with tool-steel, eg for roughing out an HSS blank.
I think they would clog very rapidly on aluminium alloys, copper and its alloys, and plastics.