Problem trying to upload DDS files into photoshop

#1

I’m attempting to start creating skins for the Pc version of AE, and I downloaded the nvidia .dds plug in for my cs3, and installed it, yet when I try to open them into photoshop, I get an error message that says “Could not complete your request because it is not the right type of document” anyway i can fix this? pretty sure I installed the plug in right

#2

Is it in the correct folder? I don’t know which folder it is supposed to go in, but I’m assuming Plug-ins/File Formats

Is it the correct version (32bit or 64bit)?