Thank you Kanegasi.
I'm having a hard time creating a 32x32 TGA file with a 1 pixel white border and a transparent rest.
Here is a photo of my photoshop at the point where I've created a 32x32 1 pixel white border square with a transparent center.
At this point, I right click the layer and choose Select Pixels
However, this seems to select the entire box, not just the border or inner square.
When I create a new alpha channel with 100% opacity, I get this:
Which suggests it's applying the transparency mask to the entire texture rather than just the "inner" square that the border surrounds.
If anyone could help me create a 32x32 .tga square with a 1 pixel white border and transparent inner square, I would greatly appreciate it.