Starting jar-files in Windows XP

I've installed the latest JDK a while ago and everything went smooth until I installed a program to open zip-files (Filzip). After installing this it claimed responsibility for jar-files too, associating the .jar with it.
Now all .jar files are of the type 'Filzip' and are being opened by that program. How can I get Windows XP to associate jar-files to java again?
P.S.: I've tried to make Filzip not to open jar-files anymore, but I was not successful.

not true. You can edit the manifest file, its just
plain text.Well, basically I don't change programs other people wrote. Eather they work, or they don't. Call me a 'stupid user'...
I don't think I really get your problem. You say you
are trying to open a jar file, but jar's are
associated with some zip program... but the zip
program will only try to open the jar file if u double
click the file itself... it makes NO difference if
you are entering the java -jar command at the console.Here is what I'm talking about.
1.) console
java ptpicker.jarException in thread "main" java.lang.NoClassDefFoundError: ptpicker/jar
java -jar ptpicker.jar(program starts...)
2.) desktop
.jar files are of type "Filzip" but I have associated them to start with "java.exe". Due to the reason that I can't pass the '-jar' parameter in Windows XP it exits with NoClassDefFoundError.

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Message was edited by:
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Hi,
thanks for your answers.
C:\Programme\sapjco-ntintel-2.1.8 containing sapjco.jar is already added to the path environment variable.
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Main-Class: MyDesktopApp.MyDesktopAppFrm
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1. Right click on File Systems and select Mount > Archive Files
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.../netbeans/modules/ext/AbsoluteLayout.jar
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5. Right-click on your MyDesktopApp.JAR file and select properties.
6. Look for the contents property click once on it and then on its elipsis button [...]
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9. Click on OK
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I hope this long explanation helps somebody to deploy Java Desktop applications. Please reply the message if it helps you just to know it was useful.
Thanks for your time....
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for more information here is the senario
because i see that you guys are some how lost because i am not providing enough information
so this is a detailed info of the problem
i have 3 classes
1) mybankmain (jframe)
2) mybankbody (all labels and buttons and events included here)
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