There is a Font Name column which you can turn on in Opus to tell you the name of each font.
Also, this plugin seems to work fine with the Fonts folder shown as virtual, although it didn't initially for some reason. (I enabled the unrelated MultiView plugin, to test if it would show something to prove to myself that plugins can see files in virtual folders and after doing that the FontViewer plugin worked fine for some reason, even if I then disabled MultiView.
Edit: Next to paragraphs crossed out. Turns out it works okay on Vista but there is indeed a problem on XP.
[s]Dinkelhopper, it might be worth debugging the file paths you get when files in the virtual font folder are selected. Maybe they're in an unexpected format?
The Text viewer plugin has no problems showing files in virtual folders (as hex in this case) so it definitely should work for all plugins.[/s]
Good work, BTW. Nice to see some new plugins!