I'm not sure what the status is on this issue, however you can use this workaround until a new release potentially addresses the problem...
(It's also good for any 32bit program which has shell extensions (context menus) which are missing when installed on 64bit windows):
Start up a separate 32bit explorer and navigate to the file/folders you wish to scan...the context menu will appear and be functional!
See KB #895561 Some Windows Explorer extensions and some Control Panel items are not available in x64 Edition.
a.) create a shortcut to:
"%windir%\syswow64\explorer.exe /separate"
(remove the quotes) and place it on your desktop
b.) Use this version of Windows Explorer when you need to use your extensions.
No need to thank me...just passing on the info!
Cheers!