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The JAR file is the executable. You are not suppose to extract it, unless your are a developer.
Java programs are often distributed as .JAR files, which are technically .ZIP archives. Older versions of WinZip and WinRAR are known to take over the .JAR file bindings, resulting in Java applications being treated as archives instead of programs. The Nokia application installer is also reported to show a similar behavior.
How to fix the problem: This problem can either be solved by simply reinstalling Java from http://java.com or by reassigning the file bindings. To reassign the file bindings (assuming that Java is in fact already installed), please follow these simple steps:
- Find a .JAR file, rightclick on it and select "Properties" from the popup menu.
- The properties dialog for .JAR files should open. Navigate to the tab, labeled "General" (should be the default active tab, when opening the dialog).
*Click the button, labeled "Change" next to the entry "Opens with". - A new dialog should appear. Select the "Java(TM) Platform SE binary" (or similar) entry from the list of suggested applications.
- Click "Ok" on both dialogs to accept the changes.
Afterwards, the program should start when the JAR file is double clicked.