Are your .jar applications opening with Archive Utility as though they were .zip files? Follow these steps to get Java back on track.
1. Right click on the file and Get Info.
2. Open the 'Open with:' section and select Jar Launcher.
- If Jar Launcher isn't available, you can find it in /System/Library/CoreServices/Jar Launcher
3. Select 'Change All...'.
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