These files can include CLASS files, which are compiled JAVA code, image files, audio files, ... To open a .jar file in Windows, you can right-click on the file and select Extract all.

How to Configure Chrome to Open JNLP Files. Java Network Launching Protocol, or JNLP files, are used for launching Java programs and Web applets over the Internet or company intranet.

Java Archive apps. Each installation of the Java Development Kit (JDK) includes a JAR utility (named jar.sh on Unix and jar.exe on Windows) that provides a variety of helpful functions for working ...