jar files some of the worst files to handle, even though it is one of the most common ways of packaging Java class files. They can just randomly start to not open or to not let you edit, change, or move them. Alternatives to Jarfix include 1Jar and Java Launcher. Jarfix is an uncomplicated program that is less than 1MB in size. If you do not have Java Runtime Environment on your machine, Jarfix will tell you where you can download it. It requires a Windows-based operating system to work (95/98/ME/NT/2000/2003/2008/XP/Vista/7/8/10) but it is not available for Mac. jar association with the Java Runtime Environment. Jarfix is a simple and useful program that's free and easy to download and install.

jar files should be assigned to and executed (opened) by the javaw.exe program when all is in working order. After installing the Java Runtime Environment for the first time. The Java Runtime Environment combines with the Java Development Kit and the Java Virtual Machine to create a powerful trio of Java platform components for developing and running Java applications.

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