I know that some zipfiles produced for Poser will fail to extract with the Windows internal zipfile/folder functions, but will work with third-party utilities. You can access the folers within the zipfile, but fail to copy subfolders. It doesn't sound as though this is the problem, but... The problem appears as files with a filename identical to the subfolders, one file for each subfolder. WinRAR has no problems, and doesn't even show such files as existing. (Makes note to avoid Poser forums when Vista comes out: will teo weeks be enough?)