Why Can't I Run JAR Files by Double-Clicking on Windows 7?

Resolving the Enigma of JAR File Execution on Windows 7

In the realm of programming, navigating file associations can present quandaries. One such conundrum arises when attempting to execute JAR files by double-clicking them on Windows 7 (64-bit), but to no avail.

Issue:

Running JAR files from the command line poses no hindrance, yet double-clicking them yields no response. The "ftype" hint, a quintessential tool for file type associations, has proven futile.

Solution:

The key to unraveling this enigma lies in the Windows registry. If the user has previously established an association for JAR files using the "Open with..." option, it has likely altered the registry settings. To rectify this, the following registry key must be expunged:

[-HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerFileExts.jar]

Once this key is removed, the following commands must be executed from the command prompt:

C:>assoc .jar=jarfile
C:>ftype jarfile="C:pathtoyourjavaw.exe" -jar "%1" %*

By executing these commands, the proper association between JAR files and the Java Virtual Machine (JVM) will be restored. Upon double-clicking a JAR file, the JVM will initiate, and the application will commence execution.

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