Spočítals bity těch Windows?
http://answers.microsoft.com/en-us/windows/forum/w indows_vista-files/pdf-thumbnails-not-showing-up-i n-folders/86165edc-9b8c-412a-bc2a-70f8732702ee?aut h=1
https://social.technet.microsoft.com/forums/window s/en-US/67e149c7-a499-4ea6-a6c3-f34ffbdc4001/no-pd f-thumbnails-in-windows-7-64bit