What is a WAR file? Learn about WAR files here
A WAR file is a actually a JAR file with specific content. WAR files are a Web Application aRchives.
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WAR file details
A WAR file has a special folder structure and contains special files in addition to JSP pages, Java servlets, Java classes, HTML pages etc. which combined forms a Web Application.
Opening WAR files
If you are trying to open or create WAR files on a Windows PC, then you will need a tool like BitZipper. After installing BitZipper, you can open a WAR file simply by double-clicking it or by right-clicking on it in Windows Explorer, or by starting BitZipper and opening the WAR file the same way you open a document in your word processor.
Notice that this is for viewing what is inside a WAR file, not for starting the Java application in the WAR file.