I'm trying to load a simple textured cube .obj file that I created with Wings 3D, but the textures are not displaying correctly.

Here's a copy of the .mtl file

1. # Exported from Wings 3D 1.4.1
   newmtl Metal_Steel_Textured_White
   Ns 100.0
   d 1.0
   illum 2
   Kd 0.74902 0.74902 0.74902
   Ka 0.74902 0.74902 0.74902
   Ks 0.333 0.333 0.333
   Ke 0.0 0.0 0.0
   map_Kd Metal_Steel_Textured_White.PNG

I'm trying to import a simple block object with a texture on one face and I can't get the texture to load.  I'm getting the following debug message in the output window..  I'm assuming that the texture load is being skipped for some reason, but I'm not sure why.  The model itself works fine, and the color appears on its face, but not the texture diffuse.

1. Loading this = ../data/block.obj
   Loading this = block.mtl
   material:         'Default_Material'
   material:         'Brick_Antique'
   diffuse:         'Brick_Antique.jpg'
   found group
   group 'block-SKP-Default_Material'
   found group
   group 'block-SKP-Brick_Antique'
   Obj Name:         default
   
   V  Size:         8
   Vt Size:         24
   Vn Size:         6
   G  Size:         3
   S  Size:         2
   
   
   objloader version 021
   18 August 2010
   http://code.google.com/p/saitoobjloader/
   
   OBJBoundingBox -     Getting the Bounding Box
   texture:        false
   texture:        true
   texture:        false
   texture:        true
   

If I have a large sketch with several hundred pages of code, is there a way to break the code segments up into smaller fragments for organizational purposes?  I know some IDEs will allow putting classes or other various code bits into different files and organizing the whole thing into projects but I'm not sure of the most efficient way to do that with processing.  Thanks for any insight you can offer on this.