I have just had exactly the same experience. Could not get my Adobe plugins to show in Xtreme.

I am running Win XP Home, which has caused grief with other programs as well. However, I have a solution to this problem here.

For Adobe plugins, copy Msvcrt10.dll and Plugin.dll from the Adobe program folder to the WIndows System folder. This cured my problem, and I now have all my Photoshop plugins registered. I believe the same method also works for FF plugins (whose website I cribbed the above from - thanx guys)

Mike