#25 Unable to find Zapf Humanist TTF

[David Encill]

For some reason, the one font I need to edit is not visible in the file list after choosing 'Open'. It is a TrueType font named Zapf Humanist BT Roman (four font files attached).
I have tried to drag the font file onto the FontForge window (not possible) and I cannot 'Open with' either (no option).
Could it be that the font is being filed as a family, rather than an individual font?
Also, is it possible to set a preference to C:\ Windows\Fonts\ rather than the default?