My .JAR file will not open. What can I use to view my images?

I have a .jar file I'm trying to open and I'm getting an error message saying I need to look up a program or search a program to use in order to view my images.  Is there anything I can use that I do not have to pay for?
PrecisionAsked:
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Gerwin Jansen, EE MVETopic Advisor Commented:
A .jar file is a Java archive, format is zip (compatible), you should be able to read it with 7-Zip: http://7-zip.org

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PrecisionAuthor Commented:
Thanks!
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