Downloaded English manual for PX-716SA http://www.plextor.com/english/support/manuals/manuals.html.
PX-716UF - IEEE 1394 FireWire and Hi-Speed USB 2.0 PX-716A (Atapi) PX-716A /SA(Atapi and Serial ATA) PX-716AL(Slot Loading Drive)
Tried to open with Winzip but got error - ‘Cannot open file: it does not appear to be a valid archive. If you downloaded this file, try downloading the file again.’ Error keeps repeating. How can this be fixed?