Photoshop Plugin Problem

Hello,
Im trying to install a Photoshop plugin from Vischeck: Downloads
(Its a plugin that allows for colour blindness in images)
Im using OSX 10.4.11 and PS CS3, Also tried 10.5.5
I have dropped it into the Plugins folder as per instructions restarted PS and it does not appear in filters menu in any RGB image I open.
I tried adding a additional plugin folder in PS in preferences - Plugins
but still nothing. There is no mention of the plugin not being compatible with CS3.
I would be very grateful of any help
Many thanks

PS. The Icon for the plugin is correct.

works fine in CS2, I have it installed in Applications / Adobe Photoshop CS2 / PLugins

Maybe try adding .plugin to the end of the filename

Have tried that but still no luck Im afraid, I have just opened the plugin package contents is there anything in there I need to change?

How many plug-ins do you have installed?
Photoshop only shows so many. (don't remember how many)

I only have the standard ones that come with photoshop loaded

Question

Hi Ruskers!

I have exactly the same problem. Did you find a solution for this?
Thank you very much!
=)