You have created a very nice program, and quite easy to use compared to many of the others I have used in the past.
Unfortunately, there is no "*.NIF" extension support. And after a very extensive internet search, I couldn't find any plugins to add that functionality.
I would love it if either you added in support for this file type, or if someone out there made a plugin that added this file type into the program.
You can contact me at: