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You don't use Textpad to open JAR files...
You can either extract the files with jar xvf and remake the JAR with jar cvf
Or use something like winzip.
And in case you don't have access to Google: http://soadev.blogspot.com/2010/03/customising-dynamic-tab-shell.html
Furthermore (and as hinted by Suresh) - no need to do this any more, see http://www.oracle.com/technetwork/developer-tools/adf/uishell-093084.html