How to open/run .jar file (double-click not working)?

To open a .jar file on a Windows system, you can do one of the following:

1. Double-click the .jar file. This should open the file if you have Java installed on your system and if the .jar file is associated with the Java runtime.

2. Use the java -jar command to run the .jar file. Open a command prompt and navigate to the directory containing the .jar file. Then, enter the following command:

java -jar filename.jar

Replace filename.jar with the name of your .jar file. This will run the .jar file using the Java runtime.

If you are using a Mac or a Linux system, you can use the java -jar command in a similar way.

I hope this helps. Let me know if you have any questions.