How to use a .jar?

cdietschrun

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I have Windows Vista 64 am trying to run MARS ( a MIPS Assembler Simulator ) and it comes in a .jar. When I click to open it, WinRAR opens and I don't have anything useful that I can use to run this program.

Can anyone help me out?
 
I think I mis-communicated my point. I can open it and browse the things, but I believe .jar files are supposed to be programs, because when I open it, there's nothing to run.
 
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