NIF file

NIF file (NetImmerse File) is a format used by Fallout games using the Gamebryo and Creation Engines.

Gameplay
These include Fallout 3, Fallout: New Vegas (Gamebryo Engine), Fallout 4, and Fallout 76 (Creation Engine).

The format is used to store meshes (3d geometry) used by the game, such as characters, creatures, weapons, scenery, landscape, and others. NIF files are typically stored in BSA archives and can be viewed with official tools such as the GECK or Creation Kit and modified using third-party software.

Third Party Software
NIF files can be viewed and modified by third-party software. NIF files may need to be converted to another file type to be read by some third-party software. Both Nifskope and Outfit Studio will convert to the .obj format which is an open format.
 * Autodesk: 3ds Max
 * Blender
 * Maya
 * NifSkope
 * Outfit Studio