Just found this useful unknown feature for uploading and displaying DOCX or XLSX image cover thumbnails in a SharePoint 2010 Asset Library.
This works using SharePoint 2010 and a default Team Site template on a non-Publishing site, straight out of the box.
For Word and Excel 2010 and higher, when a Document is Saved As, there is a Save Thumbnail checkbox.
Select Rich Media Asset as Content Type; Video Content Type also works.
So far I have tried DOCX, XSLX, PPTX files.
PDF files do not display at this stage.
My next challenge is to get the Rich Media Content Type into an existing Document Library.
I’ve done some research and couldn’t find any other posts relating to this.
If anyone know of any, post them in the comments section.
Thanks for reading.