I downloaded some hdr images for scenes and paste them into the newly created folder but I cannot access them when I try to see in sw2013. can you help?
It is tough to say. The help file for SW2017 refers to HDR in the sense that the software makes use of an HDR to solve for lighting, but it never states that an HDR file can be imported. Instead it suggests adding and editing lights to the scene.
These is a reference that SolidWorks Visualize makes use of an HDR folder. But Visualize did not exist in 2013, I think visualize did not come out until 2016.