How to run a JAR file in Windows 11/10 Since Java or JAR files can’t run on Windows on their own, you need to install the Java Framework or what is popularly called Java.

If you have the Java Runtime Environment installed, and the JAR file is executable, it should open with a double-click. Sometimes, you might see a pop-up to choose which app to run the file.

Run or open a JAR file? Sometimes when a person uses the term “open a JAR file” they really mean they want to run a JAR file. To run a JAR file you must first install Java on your computer. With Java ...