dds file image names?

[ERROR]

Hey, just a simple question here.
I searched the forums for this, but had no luck.

I'm looking for info on how to change icons in game with UI builder.

I see where the XML files call the stock dds files. But the dds files contain about 20 different icons each. The one I'm trying to change is 'youarehere' ... it's the point on the map that tells you where you are.

Say I wanted to change it to another stock icon within that same dds file. How would I find out the names of the other icons?

Thanks in advance.