Switch to the Broker Application Development
perspective.
In the Resource Navigator, right-click the message category file
(*.category file extension) that you want to
delete, then click Delete on the pop-up menu. Alternatively
select the message category file in the Resource Navigator and then either
click Edit> Delete, or press the Delete key on your
keyboard.
On the Confirm Resource Delete window, click Yes to
delete the message category file. Alternatively, to cancel the message category
file deletion, either click No or press the Esc key.
Tip: Once you have deleted a message category file, the
action cannot be undone.