The wizard asks you to enter the filter name and add includes and excludes patterns. The preview box underneath provides a list of files matched to the defined patterns (see the figures bellow).

In order to set up a default fileset relative to the fixed configuration of the server runtime, use the following variable: ${jboss_config}, i. e. you should enter server/${jboss_config}/ in the Root Directory option. This allows you to modify the runtime's configuration and not have to manually update paths.

Notice, that the Browse button still returns an absolute path:

After the filter is created, you can explore it by expanding the Filesets category in the Servers view.

It is now possible to edit files directly from the Filesets category. Double clicking on a file from Filesets opens up the editor automatically, or you can use the Edit File context menu command.

To delete a file filter (or just a file) from the Filesets, right-click a file filter or file and select the Delete File Filter or Delete File command.

If you want to set filesets for some server types, select Window → Preferences and then select Server → Default from the categories available on the left.

By right-clicking on the XML Configuration node you can create a new category. Besides, context menu for XML Configuration category makes possible to disable it. You can disable any category in the bottom part of the Servers view. Look for them in the Inactive Categories afterwards to re-enable.

By right-clicking on the Ports category, or any other category in XML Configuration, you can create a new XPath.

After that, the dialog shown below will appear.

The goal here is to get an end result where the XPath matches up with a necessary property. With that in mind, let's look how it works. If the property you want to reach is the value of the name attribute in the element <mbean>, then your XPath Patten should end with mbean and your Attribute Name should be name, as demonstrated in the next figure.

...
<server>
...
    <mbean code="org.jboss.ejb.EJBDeployer" 
                   name="jboss.ejb:service=EJBDeployer" xmbean-dd="">
  
     <!-- Inline XMBean Descriptor BEGIN -->
         <xmbean>
             <description>
                    The EJBDeployer responsible for ejb jar deployment</description> 
               ...
         </xmbean>
     </mbean>
</server>

If your desired field is the text of an element <description>, your XPath Patten should end with description and Attribute Name field should be left blank. When finished, click the Preview button to see how many matches are found for that particular XPath.