If your Bolter Rifle or Chain sword are packaged in a such a manner as to there being two folders labeled Mac OSX and Weapon_Bolter_Rifle/Chainsword as the first in the directory, delete the Mac OSX folder, extract everything from the Weapon_???? folder and put it in the first directory. Then once everything from the Weapon_???? folder is in the first directory, delete the Weapon_???? folder you extracted everything from, it should be empty.
If you have any knowledge, you should know what I'm talking about and be able to perform this task.