[Fixed]Java Won’t Open .jar Files; Jarfix Doesn’t Work

Java is a popular programming language that allows developers to create applications that can run on different platforms. Java applications are often packaged as .jar files, which can be executed by the Java Runtime Environment (JRE). However, users sometimes encounter issues where Java fails to open .jar files, even after trying the commonly recommended solution – using Jarfix. In this article, we will discuss the problem, explore its possible causes, and provide detailed steps to fix it.

Understanding the Problem

When Java fails to open .jar files, it means that the JRE is not properly associated with the .jar file extension. As a result, when you try to open a .jar file, the operating system does not know how to execute it using Java. This can be frustrating, as it prevents you from running Java applications packaged as .jar files.

Reasons for the Problem

Several reasons can contribute to Java’s failure to open .jar files. Some of the common causes include:

Incorrect File Association: The file association between .jar files and Java may be incorrect or missing. This can happen due to various reasons, such as changes made by other software installations or manual modifications to the system settings.

Corrupted Registry Entries: The registry entries related to Java or .jar file association may have become corrupted. This could occur due to malware infections, system errors, or improper handling of registry settings.

Conflicting Applications: Certain applications or tools installed on your system may interfere with Java’s ability to open .jar files. This can be caused by conflicting file associations or settings, leading to conflicts between different programs.

Outdated Java Version: Using an outdated or unsupported version of Java can result in compatibility issues, preventing it from properly opening .jar files. It is important to keep Java updated to ensure compatibility with the latest file formats.

Fixing the Problem

To resolve the issue of Java not opening .jar files, follow these detailed steps:

Step 1: Reinstall Java

Before proceeding with other troubleshooting steps, it is recommended to uninstall the existing Java installation and reinstall the latest version. This ensures a clean installation and resolves any potential issues.

  • Press Win + R on your keyboard to open the Run dialog box.
  • Type in appwiz.cpl and press Enter.
  • In the Programs and Features window, locate the Java entry.
  • Right-click on it and select Uninstall.
  • Follow the on-screen prompts to complete the uninstallation process.
  • Visit the official Java website and download the latest version of Java.
  • Run the downloaded installer and follow the on-screen instructions to install Java on your system.

Step 2: Associate .jar Files with Java

To ensure that .jar files are correctly associated with Java, follow these steps:

  • Locate a .jar file on your system.
  • Right-click on the .jar file and select Open with > Choose another app.
  • In the “How do you want to open this file?” window, click on More apps.
  • Scroll down and click on Look for another app on this PC.
  • Navigate to the Java installation directory (usually “C:\Program Files\Java”).
  • Open the “bin” folder and select the “javaw.exe” file.
  • Check the box that says “Always use this app to open .jar files”.
  • Click OK to associate .jar files with Java.

Step 3: Verify Java Installation

To ensure that Java is properly installed and associated with .jar files, follow these steps:

  • Open the Command Prompt by pressing Win + R, typing cmd, and pressing Enter.
  • Type in java -version and press Enter.
  • If Java is properly installed and associated with .jar files, the command will display the Java version information.

Step 4: Use Alternative Jarfix Tools

If the above steps didn’t resolve the issue, you can try alternative tools that fix .jar file association. Some popular options include JavaExe and Jar Opener. These tools specifically address .jar file association issues and can provide an additional solution to the problem.


Encountering the problem of Java failing to open .jar files can be frustrating, but with the comprehensive steps outlined in this article, you can resolve the issue effectively. By reinstalling Java, associating .jar files with Java, verifying the installation, and using alternative jarfix tools if needed, you can overcome the obstacles preventing the smooth execution of Java applications packaged as .jar files. Remember to ensure that your Java installation is up-to-date to avoid compatibility issues with the latest file formats. By following these steps, you will be able to run .jar files seamlessly and enjoy the benefits of Java applications.

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