In this particular case I do this to solve the problem:
1. Import the zip file with import furniture;
2. Select and than Modify furniture...->Materials:Modify...(as hansmex specify)
3. Select material_3 and set invisible ->OK;
4. Select and export selection as obj; give them a name;
5. Import it as furniture and You will have desire furniture.
All's well but this is not always the case.
In other cases I import and modify the obj with AOI and then import as furniture with cautions at dimensions.