java.lang.NullPointerException
   at sun.awt.shell.Win32ShellFolder2.pidlsEqual(Win32ShellFolder2.java:498)
   at sun.awt.shell.Win32ShellFolder2.equals(Win32ShellFolder2.java:491)
   at org.openide.filesystems.FileUtil.toFileObject(FileUtil.java:993)
   at org.netbeans.modules.cnd.utils.MIMESupport.getFileMIMEType(MIMESupport.java:86)
   at org.netbeans.modules.cnd.utils.filters.HeaderSourceFileFilter.accept(HeaderSourceFileFilter.java:73)
   at org.netbeans.modules.cnd.utils.filters.CndOpenFileDialogFilter$Adapter.accept(CndOpenFileDialogFilter.java:91)
   at org.netbeans.modules.cnd.utils.filters.CndOpenFileDialogFilter$HeaderFilter.accept(CndOpenFileDialogFilter.java:114)
   at javax.swing.JFileChooser.accept(JFileChooser.java:1576)
   at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.run0(BasicDirectoryModel.java:231)
   at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.run(BasicDirectoryModel.java:211)