STEPS TO REPRODUCE
1. Launch 3DXchange 6
2. Load a random prop (e.g. Arc_001)
3. Click Export OBJ on Toolbar
4. On Export OBJ panel, click to export directly and save the file to desktop
5. Open .mtl file by Notepad

ACTUAL RESULT
Lack of the info for specular map

EXPECTED RESULT
The info of specular map should be included in the .mtl file