Sagethumbs works here on most of them. Is ghostscript working? Try gsview on one and see if it displays it. If it does, ghostscript probably is working and sagethumbs should too. Eps files can include a prievew, which I think sagethumbs goes to first. But is there is no built in preview, that is when ghostscript is supposed to step up and make one. http://www.ghostgum.com.au/software/gsview.htm