Jarfix 3.0.0 LATEST
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Jarfix 2021 full offline installer setup for PC 32bit/64bit
The root cause of the problem above is, that a program has stolen the .jar association. If you have installed the Java Runtime Environment the first time, the file type called "jar" is assigned to javaw.exe correctly. "jar" is an abbreviation for "java archive" and javaw.exe is the correct program to execute a .jar. However, on Windows, any program can steal a file type at any time even if it is already associated with a Jarfix app.
Many zip/unzip programs prefer to do this because a jar is stored in the .zip format. If you double-click on a .jar, your pack program opens the file, rather than javaw runs the program, because your pack program ignores the meta-information which is also stored in a .jar. In the Oracle bug database there is the low-priority report 4912211 "add mechanism to restore hijacked .jar and .jnlp file extensions", but it has been closed as "Closed, Will Not Fix".
You may also miss the file connection with .jar if you are using a free OpenJDK without an installer. Reinstall the Java Runtime Environment or fix the Windows Registry manually each time this problem occurs.
You can fix this problem very easily with the small but reliable jarfix.exe program. Just double click on it to restore the .jar association with javaw.exe.