Texture is repeating even though I applied it to a single face.

Hello!

I am using Blender 2.48a and last night I finally managed to get my textures to appear due to a silly mistake I had made, but even though I've applied the texture to a single face on the model, and it renders correctly within Blender, when I export and view it in ShowTool, the texture has wrapped to every face. So for example, if I make a cube, I apply a texture to a single face, set up the materials and export, in ShowTool it shows up with that same texture on all 6 faces. Would someone known what I should be trouble-shooting here? ShowTool? Blender or the Exporter?

Any help is much appreciated. :)

Thanks!
Ian