The Bot operates ontop of a so called Navigation Mesh. This is a surface generated from many Triangles which present the input mesh data. In order to build a navigation mesh, the triangle mesh has to be recorded.

Under C:\Minionapp\Bots\xxxx\Navigation\ you'll find all navigation meshes.
.obj - “mesh input data” aka the yellow mesh
.nx2 - the built navmesh (from the input data) aka the purple-ish mesh
.omc - offmesh connections
.cub - cubes for under water
By default, the .obj files are 0 bytes. This data is only needed for people modifying the meshes. To not forcing everyone to download several GB of not needed data, these files are empty. If you want to edit an official navigation mesh file, you'll need to be given access to the original .obj file and have to replace the one in your local folder. Then you can edit the navigation mesh.