How to Open .JAR Files in Windows
The JAR file extension stands for Java Archive and is actually just a compressed directory holding the files needed to run a Java application. The compression format used is the same as with ZIP files, so Windows Explorer should be able to open them natively. However, due to file associations in Microsoft Windows, the JAR file format will always attempt to run the application instead of open the archive. By adjusting a file association option from the Microsoft Windows command line you can open JAR files natively in Windows Explorer.
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Instructions
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Press the Windows key and "R" simultaneously to open the Run dialog.
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Type in "cmd" and then press the "Enter" key to launch a Windows command prompt.
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Type "assoc .jar=CompressedFolder" and then press the "Enter" key to change the JAR file association.
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Launch a Windows Explorer window and navigate to your JAR file.
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Double-click the JAR file to open the archive like you would a regular ZIP file.
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References
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Comments
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I created a source java file with instruction to create a text file and System.out.println(...) on screen, application has written to open in console mode, next I compiled source as.jar file in BlueJ and after them I executed it by simple click (having jre on windows xp). I didn't can see any console with results but text file was created.
