I’ve been making maps for the past week, done my own map, but I tought doing all tuts 
this was quite easy till I had to load models and I got this fault in radiant:
vfsExtractRelativePath: C:/Program Files/Wolfenstein - Enemy Territory/etmain/models/mapobjects/trees_sd/tree_a.md3
cleaned path: c:/program files/wolfenstein - enemy territory/etmain/models/mapobjects/trees_sd/tree_a.md3
Matching against c:/program files/wolfenstein - enemy territory//etmain
vfsExtractRelativePath: failed
trying with a short version
vfsExtractRelativePath: C:/Program Files/Wolfenstein - Enemy Territory/etmain/models/mapobjects/trees_sd/tree_a.md3
cleaned path: c:/progra~1/wolfen~1/etmain/models/mapobj~1/trees_sd/tree_a.md3
Matching against c:/program files/wolfenstein - enemy territory//etmain
vfsExtractRelativePath: failed
WARNING: could not extract the relative path, using full path instead
In the 3D thing I get a some kind of cube instead of a tree.
