The .bin files are MacBinary format (goofy for files that are already inside a stuffit wrapper, but that's what they do). Then use The Unarchiver or Stuffit Expander on the .bin files to get the fonts inside.
Or, for an easier fix, ignore the "Mac" versions of those fonts and grab the "Windows" ones. For TrueType fonts, OS X will be just as happy and you can avoid all the silly extraction steps. (Old pre-Opentype PostScript fonts get a little more complicated, but that's not what we have here.)