FileInfo.com


.JAR File Extension


File Type Java Archive File
File Format File
Common? No
File Description Archive that contains multiple Java files and is compressed using .ZIP compression; stores Java classes and metadata and may be digitally signed; runs as a program if the Java Runtime Environment (JRE) is installed on the computer.

JAR files are used by Mozilla Firefox, Thunderbird, SeaMonkey, and Sunbird to store themes and add-ons.
Program(s) that open jar files Mac: Java Runtime; Any Web browser
Windows: Java Runtime; Corel WinZip; Any Web browser

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/jar