Edit a 'Renderworks Background' image in photoshop?

[hollister design Studio]

1. So I have and HDRI renderworks background image I like (acquired form a VW tutorial) but want to add some detail in photoshop (with the spherical panorama editing tools).

I'm not sure where to find the image file from the background?

Right clicking in the resource manager doesn't seem to proving a "go to folder" option.

 

2.  I take spherical photos of all my sites and have used them as backgrounds in my other 3D programs... how do I import a custom spherical image to become a VW background image?

[hollister design Studio]

OK, I'm an idiot --- never mind on question #2  - a quick 'Help' search and I've got my custom image....