item = 0   Dwarf_remains   The_body_of_a_Dwarf_savaged_by_Goblins.   1   1   1   0   0   0   0   0   0   0   0   0   0   0   0

Scanner scan = new Scanner(your_old_file);
scan.useDelimiter(" "); //split with spaces

int index = 0; //keep count of current token number
List<String> newFile = new ArrayList<String>();
while (scan.hasNext())
{
      String token = scan.next();
      if (index == 0)
      {
           newFile.add("[ITEM]");
           newFile.add(...);
      }
      else
      //check all other ones here
      {
            
      }
       
      index++;
}


for (String s: newFile)
{
 //save the strings to the new file, each string on a new line.

}