In SkinStudio when you click on New skin you get 6 selections.
Universal Skin Format (USF)
WindowBlinds (UIS2)
WindowBlinds (UIS1)
Universal FreeForm Skin (UFF) for Windows Media Player
WindowBlinds (Toolbar Icons)
WindowBlinds (Animations)
The last 3 are self explanatory, but the first 3 all appear to be the same. Obviously they aren't or there wouldn't be 3 of them.
So what's the difference?
And why select one over the other?