Unable to edit most .NIF files in niftools, they simply wont load or the texture will also be a nif

[rustymoney]

Long story short is I'm trying to mod Wizard101 which uses gamebryo engine and .NIF files for 3d objects. However when I try to load say, a tree texture .NIF , it loads the file but only has 0 NiPixelData in the block list and nothing actually loads on screen. Of course these texture appear in game and If i add it as a NISourceTexture to another nif, it will add the texture, but I can't open them to edit said texture in seemingly any program. I've tried nifskope, blender with the plug in, and 3dsmax.

Also, in zones or animations that have multiple meshes and textures, the texture files are also nif? I don't understand how its possible to edit them since the only nifs I was able to edit had .dds texture files embedded in the nif, that I could extract and import again later. I've also attached 2 pictures showing the nif file loaded and attached to another nif as a texture, and then that same nif file not loading anything by itself.

Any help would be greatly appreciated, thanks!