Can't open .dds in photoshop

I have decided to start trying to make my own CC. I downloaded the Sims 4 Studio and a free trial of Adobe Photoshop CC 2014 and the Nvidia .dds plugin for Photoshop. For some reason I can't get the .dds files to open in Photoshop though. I export the texture in S4S, save it to my desktop, then try to open it in Photoshop and it says, could not complete your request because its not the right kind of document. What am I doing wrong? I thought maybe it was because I have an ATI Mobility Radeon graphics card and the plugin is Nvidia, but someone else wrote that it worked fine for them.