Saving to, or opening from, a network drive can cause problems with the document integrity - caused I guess by network variables. This is one of the common causes of the "There was a problem reading this documet (17)" error.
(While it may be true that working with files on network drives can cause problems, the reality is that many of us in a workgroup environment must do exactly that. Usually problems are only introduced when there is an unexpected loss in connectivity to the network.
In this case, through, we're talking about a very specific Windows-only networking shortcut. Web Folders provide an Explorer-like interface for FTP, WebDAV, and Frontpage Server Extensions network locations.)