Hey, I'm trying my hand at designing by following the Folige Design Tutorial, but I'm stuck on page 19:

"Now that you have all of your files renamed, let’s go back to your entities folder and using your winhex editor, open the .nif file first. (in my case, I use XVI32, so that is what I will use for example – feel free to use the editor of your choice though)

Once you have it open, you are going to see what will look like a serious error or a complete mess – don’t worry, you’ll be surprised how quickly you are able to make sense of it. That will come. For now – we will concentrate on the basics."

What .nif file do I open?