Preview for source text works, but not for translation

Hi,
when translating in SDL Trados Studio 2015 Freelance, I want to preview the translation in the preview pane from within the Editor, but a message pops up stating that my MS Word version is not compatible. I have MS Word 2013 installed and the preview for the source texts works. When previewing, MS Word is not running. I already consulted the knowledge base and related answers in this forum, but couldn't find an explanation.
Thanks for your help

Detlef