With Filestar you get 0 different skills for working productively with Gamebryo Model (.nif) files.
About .Nif
Name
Gamebryo Model
Extension
.nif
Format
Binary
Category
3D
Developer
Bethesda Softworks / NetImmerse
Description
A Gamebryo/NetImmerse engine model (NIF), used by Morrowind, Dark Age of Camelot, Oblivion, Skyrim, Fallout 3/4/76 and Starfield. Holds the mesh, node hierarchy and sometimes embedded textures; most games keep textures in separate DDS files.