Why double click not working ?

if the system have wizip/winrar installed...does it block to run executable jar whence they are doble-clicked ?
because when i doble-click on the executable jar file....it opens up in the winrar...it displays all the directory structure in the jar file.....but it never executes.
i have a jar in c:\
and i can run this way....
C:\>java -jar psae.jar Philip
Hello World Philip
why double click not working ?

This is because winzip or winrar has taken over the
Windows association with files of type .jar.
Assuming XP.YES.....its windows XP.
Click on the tools menu in any explorer window,
select "folder options" and choose the "file type"
tab. i tried that also earlier....anyway, here again one more time
please look at
http://img107.imageshack.us/my.php?image=nojar7ah.jpg
There is NO .JAR file association i find in that list.
you need to change the associaton of 'jar' to
"Opens with Java"

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