I'm working on a project dealing with TXST replacements.
Specifically, I'm testing a TXST replacement for Bellyache's wolf textures. I've created a TextureSet(TXST) record for them, but no matter what tweaks I do, I always seem to get an error saying it is "missing a rim lighting map", and the wolves glow purplish.

The TXST settings so far are:
Diffuse: Bellache's wolf.dds
Normal/Gloss: Bellyache's wolf_n.dds
Environment: Bethesda's wolf_sk.dds
Backlight Mask / Specular Map: Bethesda's wolf_b.dds

I've tested almost all combinations of ticking facegen texures/has specular map/has model space normal map checkboxes, but I always seem to still get this "missing a rim lighting map" error.

It's confusing as there are no more textures in Bethesda's textures/actors/wolf/ folder that I haven't plugged into the TXST record. I'm not sure what is missing and/or I can tweak to get this looking right without errors.

Any pro texturers/modelers know what's causing the error?
Thanks ahead of time!
- Lev

I don't even know what a rim lighting map is o.O