Okay, so I want to change the sound descriptor being used by certain animated .nifs. Doors, to be precise. Since they don't have any sounds assigned to them inside the CK, it appears they are embedded inside the actual .nif model. I just took a shot in the dark and opened the .nif with Notepad++, and indeed I can actually see the name of the sound descritpor in there. But mostly it's just a bunch of NULL symbols so it doesn't seem fully readable, so I also assume that just opening and editing a .nif via Notepad isn't a good idea. .Nif models aren't really my area of expertise, but it looks to me that they have XML info embedded in them somehow and this is what I'm partly seeing? NifSkope's XML options seem to suggest this is the case.

So what I assume I need to do is to separate the XML and mesh data somehow, make the edits I want, and then save them back together. How would I go about doing that exactly?