title: Can't decompile classes using JD-Eclipse in Eclipse Kepler
body: <p>I installed JD-Eclipse from the update site but I can't get it to work in Eclipse Kepler. I've done this with previous versions of Eclipse with no problems.</p>
  
  <p>The issue here is that when I go to Preferences > General > Editors > File associations, the default associated editor for the *.class files is "Class File Viewer (default) (locked by 'Java Class File' content type)".
  If I set the "Class File Editor" as default, the changes won't be saved.</p>
  
  <p>How can I unlock the Class File Viewer?</p>