Are You able to get other versions of this file? I think this version is missing from you archive.
you can do one quick check...on your archive browse to "F" Folder and look for subfolder numbered "00000160"..in this make sure the last rev file is present...if say..there are 10 versions of a dwg file the in that folder you should see files from 0001.dwg - 0010.dwg.
I think we determined that it is a network issue. Thanks for your help though.