MRK NiStringExtraData is handled incorrectly
https://wiki.openmw.org/index.php?title=Bethesda_Softworks_Mods
On your mod status page above, you state that this mod is fully working as in the vanilla game but, if it did work with OpenMW 0.35.1, it no longer does as the dragonflies are missing in OpenMW 0.43.0. As far as I'm able to notice, the sounds seem to be working.
Direct download link so that you can test it: https://cdn.bethsoft.com/elderscrolls/morrowind/other/bittercoastsounds.zip
I didn't forget to add the meshes and textures.
How to reproduce the problem: install the mod and go to any pound, the one near the lighthouse in Seyda Neen is a perfect example. You'll see that the dragonflies are missing.
Windows 7 sp 1 up to date.
OpenMW 0.43.0.
I join two scree shots, one taken in OpenMW 0.43.0 and the other taken in vanilla Morrowind.
(RM-4419 from redmine: created on 2018-05-19 by lady onthemoon, , closed on 2018-06-09 by Andrei Kortunov)