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Java.io.FileNotFoundException: (Access is denied) obviously show something is wrong with file permissions. If you have sufficient file permission than possible reason both in Windows and Unix is might be some other process is using that file which may prevent jar command to list down contents of war file or extract content of war file. By the way if you are not aware of than its good to know that jar file can be used to see contents of both.jar and.war file. I haven't tested.ear file but I am sure jar command can extract that as well because they are kind of zip file. Further Learning.
Aug 16, 2013 ERP ofbiz installation guide lines step by step.