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[ JDK VERSION : 1.7 ] If a file type is not known to NetBeans then it should pass it on to the Desktop API ( http://java.sun.com/developer/technicalArticles/J2SE/Desktop/javase6/desktop_api / ) to see if the underlying system can open it. As an example NetBeans tries to open up a .docx file (which understandably fails) At this point it should be passed to the underlying system to see if it has better luck opening the file- if there is a compatible application available to the system then the file will be opened.
We use desktop API to open unknown files, but docx is not unknown, it is a ZIP file. Feel free to donate a patch for better handling of it.