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When selecting a file that is part of a project and already open in the editor the window is selected containing the file. If you do the same with --open you open a second file if you left this file open the last time you left NetBeans. Test1: No project en files open in the IDE: ".....\NetBeans 7.0 Beta\bin\netbeans.exe" --open ....\NetBeans\RubyProject2\Sources\newmain.rb Will open the file as expected. Close NetBeans with the file still open in the IDE Run the previous again The file is loaded again. You have now 2 file open.