Like the MS documents it is not meant to be parsed into memory but directly dumped from the file and ready to go, they used this in a time when computers were t

Like the MS documents it is not meant to be parsed into memory but directly dumped from the file and ready to go, they used this in a time when computers were too slow otherwise to do meaningful things to documents. Due to their success in these earlier years they never had time or lust to change this into a proper parsed format like most file formats nowadays.