Add file extension

File extension JAR

The most common cause of problems with opening the JAR file is simply the lack of appropriate applications installed on your computer. In this case, it is sufficient to find, download and install an application that supports the JAR file format - this type of programs are available below.

File type Compressed Archive Format Package For Java Classes And Data Format
Developer Oracle



It should be noted that some coded data from files that your computer does not read can be sometimes previewed in a Notepad. This way, we will read passages of a text or numbers. It is worth checking if this method can also be applied to the JAR files.

What should be done when an application from the list has already been installed?

Often, an installed application should automatically link to a JAR file. If it did not happen, the JAR file can be linked with the newly installed application manually. Simply right-click on the JAR file, then from the available list select "Choose default program". Next, select "Browse" and find the application you selected. These changes have to be confirmed by pressing the "OK" button.

Programs that can open the JAR file

  • Java Runtime EnvironmentJava Runtime Environment
  • WinZipWinZip
  • Web browserWeb browser
  • EclipseEclipse
  • 7-zip7-zip
  • JAR/JAD to APK Online ConverterJAR/JAD to APK Online Converter
  • ALZipALZip
  • IZArcIZArc
  • WinRARWinRAR
  • ZipZagZipZag
Mac OS
  • WinZipWinZip
  • Java Runtime EnvironmentJava Runtime Environment
  • WinZip Mac EditionWinZip Mac Edition
  • Java Runtime EnvironmentJava Runtime Environment
  • Web browserWeb browser

Why can’t I open the JAR file?

However, problems with the JAR files can also have a different background. Sometimes even the software, installed on your computer, that supports the JAR files does not solve the problem. The reason for the fact that the JAR file can’t be opened and used can also be:

- an incorrect link to the JAR file in the registry entries
- corruption of a JAR file, that you want to open
- infection of a JAR file (viruses)
- insufficient computer hardware resources
- drivers out of date
- accidental deletion of the JAR file from the Windows registry
- incomplete installation of the program that supports a JAR file?

Solving these problems should allow the free opening and working with the JAR files. If the computer still has problems with the files, use the services of an expert who will diagnose a specific cause.

My computer does not show file extensions, what should I do?

In the standard Windows settings, a computer user cannot see the JAR file extension. However, you can successfully change this in the settings. Just go to "Control Panel" and select "Appearance and Personalization". Then, go to the "Folder Options" and open the "View" tab. On the "View" tab, you will find "Hide extensions for known file types" – you should mark this option and confirm by pressing "OK". At this point, the extension of all files, including the JAR files should be displayed after the file name.