def globNames
      @globNames = globEntries.collect { |e| e.namespace == NTFS::FileName::NS_DOS ? nil : e.name.downcase }.compact if @globNames.nil?
      @globNames
    end
def globNames
      @globNames = globEntries.collect { |e| e.namespace == NTFS::FileName::NS_DOS ? nil : e.name.downcase }.compact if @globNames.nil?
      @globNames
    end
Return all names in this index as a sorted string array.