Pretty much as the title states, the Explorer extension menu doesn't show up at all in Vista x64 (32-bit too, I would imagine) The 64-bit 'ExpShell64.dll' file is there, but not doing anything.

try rebooting your pc. I does work on my XP-x64 system

Explorer extension appears fine on Vista-32 bit

No good after a reboot. Still doesn't show

did you install for all users or just yourself?

I suggest you uninstall and reinstall clamwin, I tested it on a clean Vista x64 system and the "Scan with clamwin" option is there in the explorer context menu

Hmmm, well if it works for you, then it must be something on my end. I don't recall if I installed it for all users or just for myself, I'll re-install and see what I can get it to do.

I looked in RegEdit: there is an entry in HKCR\Folder\shellex\ContextMenuHandlers named 'ClamWin' that points to the right 64-bit DLL file in the ClamWin\bin folder, so I don't understand why it won't show up. I'll keep playing with it. Thanks for letting me know it works on your 64-bit Vista.

Ah, thanks alch! I uninstalled and re-installed and selected "install for all users," and now it's there!