Installing an ATN file in Photoshop Elements?

I must be missing something...

I have Photoshop Elements, which came with my camera. While it has a pretty nice collection of filters, it's missing one (star filter) that I particularly want and I found a few others that would be useful too.

So I downloaded a handful of .atn files. According to the supplied documentation it appears I should only have to drop them into the "appropriate" plug-ins directory to have them recognized. I tried just dropping them into the "filters" directory, nada. I tried adding my own plug-ins directory, also nada. I poked around and found a bunch of .atn files inside the "preview" directory so I dropped the new ones into there, nada.

WTF am I missing?

Thanks for any help.

jim