What is xxxAvatar when importing a .obj file ?

When I export an object from Blender to 3ds format, and import it as a new asset in unity, it create :

  • A folder containing the texture.
  • A .obj containing something looking like the mesh AND something named objAvatar.

What is this last thing ? I think it’s useless and I want to delete it (when importing or exporting, no matter) but am I wrong or else, how could I do it ?

Ps: Sorry for the mistakes, I’m french.
Pps: it does the same thing with .fbx, .dae, .3ds, .blend

It’s for use in Mecanim. You can’t delete it. If you’re not using Mecanim then just ignore it.