Sow thumbnails as miniture docs

I think I can recall that Dir Opus 8 can be configured to show thumbnails as miniature docs for certain applications such as Word Or PDFs. But I cannot find how to do it. Can anyone help?

Turn on Preferences / Listers / Thumbnails: Use shell image extraction for formats Opus does not understand.

I don't seem to get thumbnails for Word or Excel documents but I get them for PowerPoint and PDF files. (Note that with PDF files it's dependent on the file being saved with a flag which enables thumbnails.)

Not sure if there is a way to get Word to generate thumbnails.

Word thumbnails unfortunately are only shown if you had ticked the option "save preview" in "File -> Properties" in each and every respective Word document.

Therefore a thumbnail extraction Dopus plugin for Word thumbnails would be greatly appreciated.