Just like when using Windows, sometimes it is necessary to make special hidden system files visible to Finder.  There is no preference for it, but with a simple Terminal command, things can be made visible very easily, on a privileged user account.

Simply open the ‘Terminal’ application, and at the prompt, type:

defaults write com.apple.finder AppleShowAllFiles TRUE

and then:

killall Finder

This will cause all Finder windows to close and then reopen with the hidden files, visible and identifiable with a ghost-like appearance. You should be able to interact with them normally now.