Editing LoL Particles in PS !HELP!

Hi, so recently I've been editing a lot of champion particles and skins. Mainly just re-coloring them.

However I have come across a problem; When i extract some particle files (.dds) they show up in the folder with a transparent background. When I open them in Photoshop look really weird, the transparent back round is gone and the colors change.

This is probably a really stupid question with an easy explanation. I believe it has something to do with alpha channels and all that. I'd really appreciate it if someone could just explain why this is happening and how i can edit these files successfully.

• PS: Would Post this on League Craft but it would never get seen.