Ed A - 2007-01-24

I unpacked the downloaded .jar and put the result in the plugins directory thusly:
C:\Program Files\IBM\Rational\SDP\6.0\eclipse\plugins\net.sf.jadclipse_3.2.4
01/23/2007  03:39 PM    <DIR>          .
01/23/2007  03:39 PM    <DIR>          ..
01/23/2007  03:39 PM    <DIR>          icons
01/23/2007  03:39 PM    <DIR>          META-INF
01/23/2007  03:39 PM    <DIR>          net
01/24/2007  02:37 PM                21 plugin.properties
01/24/2007  02:45 PM             2,855 plugin.xml
C:\Program_Files\IBM\Rational\SDP\6.0\eclipse\plugins\net.sf.jadclipse_3.2.4\net\sf\jadclipse\JadclipseClassFileEditor.class
  ("_" represents space)
Brought up RAD 6.0, went to Workbench Preferences and tried to set up a new association for .class files.  The Jadclipse Class File Editor does not appear in the list of internal applications.
So I modified the plugin.xml file to more closely resemble other plugins, replacing the simple <plugin> line:
<plugin
   id="net.sf.jadclipse"
   name="Jadclipse class file editor"
   version="3.2.4"
   provider-name="Pavel Kouznetsov"
   class="net.sf.jadclipse.JadclipseClassFileEditor">
That didn't help; I still can't see the plugin in the list.  Any ideas?