Many of you programmers of related information technology study maybe all of you know about .jar file extension. File extension JAR is a compressed file package used for classes and data and famous among JAVA programming. Actually, .JAR is also a compressed file like .ZIP unrelated to ARJ .JAR file format. If your Windows can’t open this file extension JAR you can use specific software installed on your computer otherwise you will have error. To know more about file extension JAR you can visit this website and it tell you what JAR file extension is. Just visit http://www.fileextensionjar.org/ where there is an explanation about .JAR extension and also you can download for free software like Driver Detective where this software will try to resolve you problem like hardware drivers where it scan you computer hardware then find suitable driver for your computer and update you hardware driver. So, if you have trouble to open unknown file format or need to update driver just visit this website and who knows this can resolve your problem