Thanks guys for the extensive help. Much appreciated. To answer the question what I'm trying to achieve upfront. I'm trying to import a specific NPC face from FNV into Blender. With Fallout 4 and its creation kit this is possible through the Ctrl F4 function which generates a NIF file from an existing NPC. Might by possible with Skyrim too and its creation kit. I do still have the 3.5 version of the Facegen Modeller demo. The problem is that the free version does not allow to use a custom head model, specifically the standard head mesh from FNV. So even if you import the NPC specific facial settings as .FG file, it will only be applied to the demo head model and look differently compared to in-game. The FG file only contains 50 float values for storing the facial settings. And Facegen Exchange basically copies these values from one place to another. The only approach I can think of is extracting all morph data from the FNV head TRI file as obj files and import them into Blender. And then somehow apply those 50 floats in Blender. Or 3ds Max if that has better support. But I have no idea how to apply morphs like that. It seems excessive compared to a single Ctrl F4 in the creation kit.