Downloaded windows installer version Nuxeo 5.7.1 and installed. I uploaded one office word document and then tried to preview it by right click and select preview button. preview unable to display and shows below error message.
org.nuxeo.ecm.platform.preview.api.PreviewException: Converter any2pdf is not available
Installer missing some additional components.
If not the case, LibreOffice should be installed on your system : http://doc.nuxeo.com/x/zgJc