Although it appears that the wall is not supporting the center line, I would treat it like it is. That is not to say that you can not make an opening thru it. With load bearing support of any type it's difficult to be too safe.
This isn't a situation for experimentation. If you had the background to deal with it, you wouldn't have posted here. Do it right, and get an experienced pro involved, if only to confirm adequacy and to produce or minimally look at the plan drawings you will need for the local building inspector.