@xform ~ I apologize for not responding for some reason I did not see or receive your message even though I am subscribed to the thread. jennymac found the program via google I'll bet, that is how I found it. Again, I'm sorry I didn't your your message.
@jennymac ~ What are the file format extensions you are having trouble viewing .. I had to RESTORE my .otf and .ttf through the registry settings (don't panic) .. it's all explained here and I'll give you the link. They've already done the hard work for you, all you have to do is follow the simple instructions, and they are simple.
Before you jump into doing it read the thread, from the top down to where they list the different file formats that can be retrieved/restored to default. It will explain a few things to you.
Default File Type Associations - Restore
I followed the instructions for .otf and .ttf fonts restore and now the view is back as long as I have OPTIONS set to view Large Icons (I like the Large Icons, you can see it better) ....
Do you also use the PREVIEW PANE ??
I think once you put the Fonts in your C > Windows > Fonts Folder they should be accessible to any program you use on your computer.
A word of caution, I wouldn't load up the Windows Font Folder with every font you find. You can OVERLOAD your Windows Fonts.
Also, if I'm correct I think that can even slow down your Windows start up. I personally have a folder elsewhere that I save all my surplus fonts and only add ones I really like and know I'll use a lot to the Windows Font Folder.
Windows 7 does have a thing where you can add a shortcut of a font to the Windows Font Folder and then you are supposed to be able to use the font as if it's installed ... without the bulk of actually installing the font.
Another little bit of information, I still have SOME (a very small few) fonts, that show only the generic blue font sign but have found those fonts WILL NOT even load into a font viewer. I get an error message. I never did find out what that was all about, have had some people tell me it has something to do with the Clear Text Setting in fonts .. I honestly don't know and have finally given up on that.

I've got to when I run into that problem I just delete them, no sense in hanging onto them if you can't use them.
I hope I haven't confused you, wish I could add screen shots here to help you but I'll try and watch for any future posts you might submit.
Have a good day ~!!
Jenn