Yesterday, I was trying to add Thumbnails on my epub files i saw this the tutorial on Wiki
but it don't work on Win Seven 64bit.
Then searching on google i found CBX Shell
(CBR, CBR - thumbnails) as a alternative to CDisplayEx - Thumbnails function and work on WIN Seven 64bit.
Is easy is just install the CBX Shell and create a thumbs.reg whit this code:
Windows Registry Editor Version 5.00
if this code do not work go to the regedit.exe and look for ".cbz" replace/rename the ".cbz" to ".epub"
I hope it help somebody.