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Qt framework can generate a cocoa application with the .app structure. But NetBeans can't launch *.app applications ("open -a application.app" command). Therefore this option is switched off in NetBeans 6.7 and latest developer builds. We should to recognize such directories (*.app) and launch it if cocoa application with the .app structure is generated by framework. User's request: http://forums.netbeans.org/post-40189.html
Please evaluate
Sounds like enhancement to me.