For some reason, when I try to install the Harmonia extension, I get the
message that a filel in the extension already exists and installing may
interrupt the functionality of FW. When I go ahead and install, the extension
doesn't appear in the Commands menu. I have no other problem with any other
extension, and have reinstalled and re-updated FW twice. Help!!! I'm at my
wits' end!!!

!!!

I figured it out; for some reason the FW extensions have to be manually
installed from the EM folder as an Administrator in Vista.. Although all my
other extensions for DW, etc. were already installed perfectly... Wierd...