Use WinRAR (or similar) to unzip the . jar file and replace the files you need and then re-zip it (using a . jar file extension). You may need to rename [filename].
Try this
java -jar <jar-file-name>.jar
If you dont have an entry point defined in your manifest invoking java -jar foo.jar
will not work.
Use this command if you dont have a manifest or to run a different main class than the one specified in the manifest:
java -cp foo.jar full.package.name.ClassName
See also instructions on how to create a manifest with an entry point: https://docs.oracle.com/javase/tutorial/deployment/jar/appman.html
java [any other JVM options you need to give it] -jar foo.jar
You can run a JAR file from the command line like this:
java -jar myJARFile.jar
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