Jar files opening with RAR, WHA????????

Ok, I was trying to Hic get a great java3d platform game (brutal file manager) to load.
I tried again, exept now, the jars open with winrar!
I found my main class problem, I extracted all the files with the class, but it does me no good because I CANT EXECUTE IT!
How can I execute these again?

So you apparently changed Window's file associations to have java.exe open .jar files? Right?
How are you trying to start the game - what is the command you use? Do the game instructions tell you how to start it?
The error message "Cannot find the main class, program will now exit..." means that the jar is not intended to be an executable jar and is without a main class file. It could be caused by a mis-configuration of the game, also. . .
More definite information iis needed.

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Jar files opening with RAR, WHA????????

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