Technically, it stands for "Plain Old Documentation" or some such nonsense. It's an ancient file structure often used for data files you're not supposed to tinker with by many developers. That's not the most useful information, I understand. BUT...it explains why all the default MLB/Korean stadiums are .pod files.
I've looked at the files in a text editor...bunch of gobbledygook, very few actual words there. I'm sure it's proprietary 3d stuff guys like you and I aren't supposed to understand. Sure as <ahem> works for me. I think your problem is not solvable. Sorry...