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An attempt to open a JAR file in the IDE opens new explorer with given JAR file. This is not consistent with behavior of the IDE. I expect the file either to be opened in editor (*.java and other sources) or selected in existing explorer - preferably in Projects tab, possible in favorites. Maybe that current impl can be used as a last resort.
I like the idea of selecting it in the Favorites tab. Then you could browse beneath it. If it cannot be found in Favorites, add it as a new link.
This bug was reported against NetBeans IDE 6.0 or an older release, or against a non-maintained module. NetBeans team does not have enough resources to get to this issue, therefore we are closing the issue as a WONTFIX. If you are interested in providing a patch for this bug, please see our NetFIX guidelines for how to proceed. We apologize for any inconvenience. Thank you. The NetBeans Team