***EDIT 02/08/2015: This fix also works in windows 10 (tested in Win 10 Pro). After upgrading from Windows 7 I lost my thumbnails. I ran the program again and got them back.
I spent a fair amount of time looking for a fix which would enable PDF file preview thumbnails Windows 7 64-bit to display correctly.
In Explorer all I was seeing was the Adobe PDF icon, not a preview of the file itself.
Despite trawling the net and installing many supposed fixes and messing with the registry none worked. I was about to give up when I stumbled upon a post which linked me to the website of Leo Davidson at http://www.pretentiousname.com/adobe_pdf_x64_fix/ which contained a supposed fix. I decided to give it one more try and sure enough it did the job!
I’ve since used this fix on several machines and it performs exactly as it should. So take a look at Leo’s website and get yourself a fix which really works!
albowyn 