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The advantage that Java Script offers - namely that it runs relatively platform-independently - is also appreciated by hackers and malware programmers. For this reason, viruses are not infrequently received in emails with an attachment that has a .jar file name. These attachments should not be clicked on under any circumstances, as they start with a double click and may attack the system in this way.
You should also exercise caution if you have downloaded the jar file from the Internet or received it from unknown persons. It is not uncommon for malware to hide behind these files, which then lodges itself in various parts of the computer and spies on the user, takes over the computer as part of a botnet or damages the system.
If you are familiar with Java Script, you can decompress any .jar file with an unpacker for Windows or macOS and then look at the source code or the content of the archive.
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.