I cannot open a JAR file. What should I do? Help!
Virtually anyone has encountered some problems with opening unknown files while working on a computer. It can be very frustrating. Yet such problems, not only with JAR files, can be addressed in a standard way. Follow the steps below and we can guarantee that your problem with opening JAR will be resolved!
JAR File Extension
- File type Java Archive Format
- File developer Oracle
- File category Executable Files
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File popularity rating
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What is a(n) JAR file?
The executive file with the extension .JAR stores compressed to .ZIP format, usually digitally signed using jarsigner, manifest files, application resources and .CLASS files acting as stand-alone applications or program libraries. The files work in the Java Runtime Environment, which means they are created using the jar tool. They are usually used in mobile games.
How to open JAR file?
If given user account does not have necessary permissions to open files with JAR extension, it is highly probable that no program that supports given files is installed on the users’ system. Below is a list of actions user should pursue in order to resolve most common problems.
Step 1. Download and install application that supports JAR files
After the application has been installed, the system should automatically open JAR files with given application. Below is the list of relevant programs along with operating systems they are available for:
Programs that support JAR files
Step 2. Verify whether JAR files are associated with appropriate software
It is possible that an application that supports JAR files is not associated with such files. In such case, the program should by manually associated with JAR files (right-click on the file icon → Properties → General Tab → In submenu "Open with" and click on "Change" button. System will display a list of suggested programs that support JAR files. Choose the application by checking the box "Always use the selected application to open this kind of files". System will store this information in its registry and use it to open JAR files with the selected program.
Changing JAR file association in registry
File association for JAR files can be edited manually by editing appropriate entry in Windows System Registry. However, it is discouraged as it may introduce errors to registry if not done properly and may even damage the system.
Step 3. Check JAR file for other errors
- JAR file was not copied properly from storage medium.
- Antivirus application prevents opening JAR files. In that case it is recommended to exercise extreme caution and recover or delete infected JAR file. It is also advised to scan the entire system for malicious software and viruses with antivirus software.
- For JAR files downloaded from the internet it is advised to check if the file has been downloaded completely and is not corrupted. If not, the file should be re-downloaded.
