How do I seperate a mesh by textures in “Texture Solid” mode? (2.79)

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I have a model from a late 90s game called Re-Volt. The map is called Market2. There are multiple textures for each part of the map, but I imported them and the pieces are in multiple textures. There are no materials and there are no textures in the textures tab. I using Blender Render.

So how do I separate it by the textures and not materials?

Screenshot

bumppostmustbe

bump number 2 because nobody seems to care