Tried converting this to .mdl, seems like the bug is caused by "CoordId".
View attachment 424679
After deleting the lines with "CoordId" in them (in notepad), the ".mdl" model is openable in war3 model editor and the bones and animations are displayed properly.
View attachment 424681
Idk what CoordId does but if it's important to this model you are better off working on it Retera's.
Quick search on Hive reveals it's something to do with
unwraps like having each material layer of the same geoset have different t-vertex coordinates. The geoset has two groups of texture vertices. Usually you just have one block TVertices 370 {....(then 370 pairs of coordinates)} but in this model there are two such blocks one after another, to have the ice and the dust textures wrap differently. Then CoordId 0 in the first layer of the material points to the first block, and CoordId 1 in the second layer points to the second block. Which war 3 model editor isn't able to handle.