How to open a jar file?
To open a jar file in Windows, you will either need a copy of the Java Runtime Environment to run the file, or decompression software such as an unzip utility if you want to view one of the files within it (a jar file is much like a zip file, containing multiple files within it).
To run the file, you will need to download the Java Runtime Environment (if you do not have it already) from the below link.
Once downloaded, you can run any jar file by double clicking the filename from Windows Explorer or My Computer. Keep in mind that this will only work if the jar file to be opened in is executable. If not, you can view files within it instead.
To view individual files within the jar file, you can obtain compression/decompression software that can work with jar files. We recommend using either 7-Zip or WinRAR.
Once you have the software, you can open the jar archive from within the software, and then extract the files. Once the files are extracted, you can view any of the individual files by double clicking them (note that most files will be text files, but others may require additional software to view them).