HD Photo Plug-in for Photoshop 1.0 is a plug-in created by Microsoft themselves to add to Photoshop, which will help you get more out of your higher resolution photos.
What HD Photo Plug-in for Photoshop 1.0 really does is enable, inside Photoshop, all the options you need to be able to, from the actual image editor, load them directly into HD Photo. You can also both load and record images using HD Photo.
This, in this way you´ll get high quality photos, being able to save them (and obviously open them) in HDP or WDP formats.