I can´t open the OBJ files

I have created my first obj but neither copycady nor powershape, they are able to open it.
What could be the problem?

The problem would be that you did not meshed your scan , or you trying to open point cloud .

The name " mesh" should appear in the obj’s name after export.

When you export meshed OBJ , you always get 2 files , one is a mesh and second is a fuse ( point cloud)