Ah, this has nothing to do with what app i load the file then. It's the OBJ file that Blender writes where the normals are missing. Do a test, export then open such a file and have a look for vn above the f part. vn are the normals, f the faces index. You will find none. Or even look at the f lines. With normals it should be three numbers and two slashes. Like 1/2/1. Without normals it is two numbers and one slash.

Blender doesn't write the normals. At least here they do not make it in the file.