Java Archive File (a compressed file for applets and related files) (.JAR)

Short for Java Archive, a file format used to bundle all components required by a Java applet. JAR files simplify the downloading of applets since all the components (.class files, images, sounds, etc.) can be packaged into a single file. Additionally, JAR supports data compression, which further decreases download times.

JAR file support is the same as ZIP file support. JAR = ZIP + manifest. The Microsoft VM supports uncompressed and compressed JAR levels 0 and 1, but not signed JAR.

WinRAR provides basic operations for JAR files created by other tools:
view contents, extract files, show comments and archive information.

You can use the convert function to convert .jar files into .rar format.

You do not need to have any external programs to handle these formats.