I have installed the latest Acrobat DC update which finally appeared to support thumbnail previews in Windows Explorer in 64-bit systems. I selected the relevant option under Preferences\General but no change. New PDFs created had just the generic icon. Tried exiting the program, restarting Windows but no joy. I had installed Foxit as a workaround and so earlier created icons did have a preview. I had uninstalled Foxit when the update came through so it isn't on my notebook anymore. However, only previously created PDFs are showing a thumbnail preview. Any newly created PDFs are showing only the generic PDF icon. Does anyone have any ideas??
... View more