Ok, I just don't think I'm getting this. Once I extract the .ztd file (to 'New Folder'), I open it up. I go through New Folder/animals/18AA3026/icmherre. I edit the 'N.pal' file, and turn it into 'herrera.pal' (I am editing herrerasaurus). I then create a new winzip file (called 'New WinZip File'). I drag the animals folder (not the whole 'New Folder') into the 'New WinZip File'. A screen comes up, asking what I want to save it as. I choose 'Herrerasaurus2'. I go back to my desktop, and change Hererrasaurus2' to 'Herrerasaurus.ztd'. I try to open it up in APE, and it says that it is not a valid.ztd file. What am I doing wrong?