Random tiling textures, that start with '-0' through to '-8' were designed for the software days of halflife, the engine will take the texture and try to randomly tile it across the face. Supposedly good for large faces, where repetition can look ugly.
This is all well and good, except it doesnt work in opengl, so DONT use any random tiling textures! If you absolutely need to, just rip them using wally and rename them in another wad.