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How to get Mac to open .jar files without duplicating them?

I have seen another question on this topic, but I am unable to find the folder that the apparent solution to the problem. I am running (I think) macOS Sierra 10.12.2. The problem only started a few days ago, before that everything worked fine. Everytime I try to open a .jar file it duplicates it with the ending .cpgz

iMac, iOS 10.2

Posted on Jan 5, 2017 10:31 AM

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4 replies

Jan 5, 2017 7:22 PM in response to sportsgirlkc5

Open or Run?

If the latter, Jar Launcher is not installed by default, so any attempts to open a .jar will just expand it as it is a compressed folder.

The only way to get the Jar Launcher program is to install a Java Development Kit, JDK.

It may require the installation of Apple's Java 6.


If you installed a java version from Java.com, it does not install the Jar Launcher, but you could run the .jar using the java executable embedded in the web applet plugin that is in the /Library/Internet Plug-Ins folder via the Terminal.

How to get Mac to open .jar files without duplicating them?

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