Restoring Original .DAT's
In case you mess something up horribly, Model Viewer saves a backup of your Imported .DAT's. I will warn you now, though. this should not be your only means of .DAT backup. During heavy modding sessions these backups can easily be overwritten, leaving you with nothing but starting over if you mess something up.
- Open Model Viewer.
- Load up the Model that you need to Restore. I'm going to restore my PLM .DAT cuz even modding didn't make it cool.

- Now travel up to File>Restore DAT from Backup.
- This will bring up a selection box.

- Be sure to select the correct .DAT. If you don't you'll restore a current piece you didn't want to. Mine will be the PLM .DAT because I wanna keep my Chocobot Mod.
- Afterwards, click OK and watch the Ego Boosting Boxes popup!

- And that's it. you've restored your botched modding attempt.