Blender - texture is not loaded with?

And I have a Blender file there's a Minecraft Map and Skins in it. I would like to add items now, have a matching file where textures are present.

Now I add this file via file → Append → (select the blend file) → go to Objects and paste everything

So now I have the items and everything just without texture, I have not found help elsewhere and so ask here. (I'm also in meterial mode)

Go on rendered and see if it is displayed.
Are the materials for the right render engine?
Try adding the materials manually via the Node Editor