I've been toying around with making animals for ZT2 for a while now and realized that you can change the file extensions of files in Winrar such as xml to beh so you can easily access them and then switch them back as far as a know without damaging the file. I have DD2 and managed to open DD2 beh and tsk files in notepad before. Maybe if we make a copy of the main DD2 file and open it in winrar, change the file extensions of the xml, dds, nif files, etc. to beh or tsk, open them in notepad, copy and paste the coding in the file, put that coding into a text document, and then rename that text document the same name as the original DD2 file, and then replace the original DD2 animal's name in the whom the xml, nif etc. file belonged to to the animal you want to make's codename so you could start making an animal.
I don't know if this idea will work but it could be a way to make DD2 files accessible through renaming and copying onto a text document so to we can make new DD2 animals!