Where is the animator file stored?

I would like to replace a really huge character system's animations with new animations.
The animator controller contains really many blend trees, and exchanging the animations in the animator window really is a time-consuming task.

I would like to replace the animations by code, and therefore I would like to edit the file names directly.
Does anybody know in which file Unity stores the animator contents?

Edit: Well, I found it. The file has the ".controller" extension, but I am unsure how to read it.
Does anybody know how to disassemble that?