How to Open Jar Files on Windows? Must Have a Look!

Have you heard of the JAR file format? Here’s an explanation of what a JAR file is and how to access JAR files in Windows 10.

JAR stands for Java Archive. It is used to combine Java files and metadata into a single file. You’ve come to the right place if you want to know how to open a JAR file on Windows 10. We’ll go through what JAR files are and how to open them. When attempting to open a JAR file, you may face problems. We’ve got you covered there, too, with solutions.


What Exactly Is a JAR File?

JAR is an abbreviation for Java ARchive. It’s an archive file, as the name implies. This indicates that it is a single file that contains additional files that have been bundled together for purposes such as portability and reduced storage space.

If you’re familiar with ZIP files, a JAR file is pretty much the same thing. JAR files, on the other hand, are applications meant to be used by the Java Runtime Environment.

JAR files are distinguished by the presence of a manifest. This is a special meta-file that tells the JAR how to act and contains information about the files included within.

A JAR file can also include CLASS files (compiled Java code), audio files, image files, and other items. The Runtime Environment may then read and run the JAR file as a single request. JAR files can be used for a variety of purposes on both desktop and mobile platforms. It could be a game, program theme, or browser add-on, for example.

How to Open JAR Files?

If you want to launch the application included within a JAR file, you must first install the Java Runtime Environment. You may already have it on your computer, but you should download it again from the official site to verify you have the most recent version.

how to open jar files

You should then download Jarx, a lightweight utility. This causes JAR files to act similarly to regular programs on your machine. As a result, after installing Jarx, you can open a JAR file just like any other.

You can also use Command Prompt to run it. Click Command Prompt after pressing Windows key + X. (Admin). Then run the following command, replacing sample.jar with the JAR’s entire file path: java -jar sample.jar

How Do I Extract a JAR File?

You can also choose to unpack the JAR file. You can use this to examine what files are contained within it or to determine whether the JAR file is intended to be an executable file.

An application that can extract compressed files is required to unpackage a JAR. Although Windows has capabilities for this, you can also utilize file extraction software such as 7-Zip or WinRAR to complete the task.

how to open jar files

When you open the JAR file in the software, you can browse all of the folders and files contained within it. If you want to use or analyze the individual files further, you can also extract the JAR.

If you don’t want to download an extracting tool, you can utilize an online extractor. Archive Extractor is a good option because it is simple to use and, most importantly, it supports JAR files (not all online extractors do).

Simply upload your JAR, and it will display the file’s contents in a tree structure. To open or expand a folder, click it, and to download a file, click it.

Finally, if your computer is having trouble detecting an executable JAR file, right-click it, select Rename, and then add the.ZIP file extension. Because the file types are so closely related, this works.

JAR File Creation

Are you certain you need to create a JAR file? Remember that they serve a specific purpose: combining files to be utilized as a Java program.

If that’s what you need to do, go to Oracle’s documentation on packaging programs in JAR files. This will provide you with all of the information you need to create, package, and sign a JAR file.

How to Solve JAR File Opening Issues?

When attempting to access a JAR file, you may see an error, which is frequently caused by incompatibility or security settings.

Java Runtime Environment must be updated

Always use the most recent version of the Java Runtime Environment. To find out what version of Java you have, click the Start menu, type configures java, and then select the result. The Java Control Panel will be displayed.

Click About on the General page to ensure that the version you’re running is the most recent one accessible directly from Oracle’s website. If not, download and install it.

Jar Opens in the Incorrect Programme

Windows may be unsure what to do with the JAR file and attempt to open it in software that does not support the format.

To fix this, right-click the file and select Open with. There are various default applications to select from, and one of them may be the correct one. If not, select another app. If you want JAR files to always open in the same program, you can modify the file associations and default programs in Windows 10.

If you wish to run the file directly from the Java Runtime Environment:

  • Navigate to Java in Program Files
  • Open the single folder (jre1.8.0 281 or something similar)
  • Navigate to the bin folder
  • Run java.exe

When You Open Jar, You Get a Security Error

Because Java has been identified as a security risk, don’t be shocked if you receive a warning when opening a JAR file.

how to open jar files
To fix this, go to the Start menu, type configures java, and then click the result. The Java Control Panel will be displayed. Then,

  • Select the Security option
  • Check the Enable Java content for browser and Web Start applications box
  • Set the degree of security to High
  • If necessary, add to the list of exemption sites
  • Select OK


Hopefully, you now understand what a JAR file is, how to open it, and how to troubleshoot any issues that may arise. While this guide focuses on Windows, Java is also available for other operating systems. This includes Ubuntu, where Java is beneficial whether you’re writing or utilizing an app.

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