I'm trying to only use WED. The pure3D models are given in .3ds or .fbx and the textures are in a separate folder. I've figured that they mean

pine-le = leaf
tanne-st = stem (trunk)
tanne-ka = branch

however, even when importing them as such into WED, the leaves are a solid skin. There seems to be no transparency values. I'm still new to this, maybe there is something missing.