Yesterday, I was trying to add Thumbnails on my epub files i saw this the tutorial on Wiki (http://wiki.mobileread.com/wiki/Thumbnails) but it don't work on Win Seven 64bit.
Then searching on google i found CBX Shell (http://free-sk.t-com.hr/T800/software/cbxShell.htm)(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

[HKEY_CLASSES_ROOT\.epub\ShellEx\{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]
@="{9E6ECB90-5A61-42BD-B851-D3297D9C7F39}"


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.

Thanks, I incorporated your fix into the wiki page, which you could have done yourself if you wanted to.

Dale