From Zenluck@21:1/5 to All on Sun Jul 9 14:14:11 2017
With the recent Acrobat, a reduced image of the first page is embedded
in the thumbnail. When using Windows Explorer it is easier to see the
content of some PDF files.
With previous Acrobat versions (I own Acrobat Pro X), this feature is
not available.
Does exist a system for creating such thumbnails ?