Jar file wont open on windows 7 64 bit

I posted this somewhere else by accident but i cannot get this to open :(.

Check your windows file type associates .jar open action with something like this:
"C:\Program Files\Java\jre6\bin\javaw.exe" -jar "%1" %*If you stil have a problem, check the jar works on the command line:
Make sure your PATH variable includes (the apropreate path for your system of course)
C:\Program Files\Java\jdk1.6.0_19\binOpen Command Prompt, change the directory to the directory containing your JAR and type (assuming it's hello.jar)
java -jar hello.jarThat should run your program. If however you get
Failed to load Main-Class manifest attribute from
hello.jarthen there's no main class set. If it shows that error it's probably the JAR that's the problem. Extract the manifest:
jar -xf hello.jar META-INF/MANIFEST.MFOpen it in notepad or type
more META-INF\MANIFEST.MFit should contain the following (or whatever your main class is)
Main-Class: hello.HelloHere's an example I was working with:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.1
Created-By: 16.2-b04 (Sun Microsystems Inc.)
Main-Class: hello.Hello
Class-Path:
X-COMMENT: Main-Class will be added automatically by buildWhat do you see when you do this?

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