<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Background information

Photoshop 7.x plug-ins and third-party plug-ins designed for Photoshop 7.x are incompatible with Photoshop CS.
<HR></BLOCKQUOTE>
http://www.adobe.com/support/techdocs/329841.html
ok I found the answer on the link above

so yeah, I'm doomed to having to upgrade my plugin collection or keep both versions of Photoshop just to be able to access my old plugins.

somehow this figures.