So, I have a few games on my mac that follows the .jar extension. I was playing them normally, but trying to open the files now, instead of popping the game screen, it uses the Archive Utility, generating another file with the extension .jar.cpgz, and I tried opening it too, only to find out that it goes back and generates a .jar file. What do I do? I have the latest version of java installed.
iMac, macOS Sierra (10.12.6)
Try selecting the .jar file, command-I to open the Get Info window, and see what is chosen for "Open With".
You should be able to choose "Jar Launcher", since you have Java installed. Then click the Change All button to apply to the other .jar files as well.
I have the latest version of java installed, I even deleted it and installed again, doesn't seem to work. And I opened it correctly earlier today, but after a few hours away, It just didn't work. Anyway to know what happened?
From where did you install Java?
Java.com > Won't work, directly
Oracle.com > should work
Apple (Legacy Java 6) > should work
Files with.jar extension are programs done in Java and require the appropriate Java runtime to be installed.
It looks like you either don't have Java installed or the settings for which program opens .jar files are messed up.
I can't open .jar files properly
