Hi Markus
Sounds like Windows is associating .jar files with your PowerArchiver.
To get around this, right click on the installation file and under the Open With menu, select Java(TM) 2 Platform Standard Edition Binary.
If this menu option is not available, you can download and install the Java Runtime Environment which should make double-clicking work.
You can download the current version from Sun at http://www.java.com/getjava
Click on the link labeled Download J2SE JRE and follow their installation instructions
Tom
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