Some models from Arktwend total conversion use the NiLookAtController node.
I attached affected helm model.
OpenMW fails to load this model:
Failed to load 'meshes\Arktwend\klappenhelm0.NIF': NIFFile Error: Unknown record type NiLookAtController
File: meshes/arktwend/klappenhelm0.nif, using marker_error.nif instead
NifSkope 1.1.0 fails to load this model too.
However, Morrowind can load the model (see attached screenshot).
#1 Updated by Alexei Dobrohotov 22 days ago
is ancient, use 2.0 alphas or 1.2.0+ with Wine or at least the last release that had official non-Windows builds, 1.1.3. Or build NifSkope from source.
But Morrowind doesn't actually support it, it was only added in 10.0 revision of nif format (used in Oblivion, Civilization IV and contemporary games), then immediately deprecated (10.2) and removed (20.5) in later versions in favor of NiLookAtInterpolator. Morrowind probably simply ignores an invalid node.