I have a WAR file for a Java project but when I try to import it into Eclipse, the only option is for archive files such as tar, zip, jar – nothing for war.
Is this only an option in certain editions of Eclipse because I have a copy of SpringSource (also Eclipse-base) that allows me to import WAR files?
Would it be possible to add this option to my current version without downloading a new edition of Eclipse?

Your version of Eclipse is Eclipse IDE for Java Developers. Try download Eclipse IDE for Java EE developers
Your version of Eclipse doesn’t have the
Webtree pane.