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In UI-specification there is not specified what should the IDE do with .nbm files available in Files view. Open action on .nbm file in Files view should open Plugin Manager probably in Downloaded tab.
The description of the requested behavior was added to the UI Spec (see http://xdesign-tools.czech.sun.com:8080/JSPWiki/Wiki.jsp?page=JH_AutoUpdate_UI_Spec#install_from_view_scenario). Please, let me know whether such description covers all the use-cases and if it does, then please, mark this issue as 'FIXED'. Thx.
Thanks. Implementation is tracked as issue 103622.