The archive file is a single file that has other files packed together to decrease storage space, probability of error, and many similar reasons. What Is A JAR File JAR is the abbreviation for Java Archive files. At PHONEKY, you will find many other games and apps of different genres, from adventure and action to the logic and racing Java jar games. Nice graphics and addictive gameplay will keep you entertained for a very long time. At PHONEKY Free Java Games Market, you can download mobile games for any phone absolutely free of charge. Double click KEmulator or ‘Pcnexus Java emulator’, click ‘Midlet’. It already contains a jar game ‘Prince Of Persia Classic’ in the ‘Game’ folder. Download the J2ME emulator and unpack it on the desktop. Install the JRE for Windows 7, Windows 8 from the above link. How To Play Java (.Jar) Games On Windows PC. Compiler and JVMs (Java Virtual Machine) can understand and implement these formats for java application. Usually these file are used for archiving and distribution the files and implementing various libraries, components and plug-ins in java applications. The JAR file format is based on the popular ZIP file format.