To be able to import a model or animations, it must be in this format.
That said, using models and animations ripped from another game in a project you intend to release to the public, free or otherwise, is not going to go down well with the creators of said content.
Even without a release, you’re still talking about something that is technically still illegal. People commonly assume that as long as it is for personal use, that it’s fine to port this kind of content, but it would still violate the EULA and the more accurate way of looking at it is that it’s still illegal, but if you didn’t release it then no one can really pursue legal action.
As such you’re not likely to get that kind of help here, as it would be frowned upon. That being said, I’m fairly certain those are compiled assets for the game’s engine, and that you’d likely need some sort of development tool to reverse-engineer them.