Again, this depends on where the original skin is. In DesktopX, when I save edits, if I choose save as, it allows for saving to the default DX theme folder, as opposed to the folder where I downloaded the original file to.In which case I would still have the original too.
Windowblind skins have to be in a certain folder in order to apply them. You can't save the skin in a different place
This is why I ask what kind of skin.
I assumed it was a windowblind skin not a DX as it is in the SkinStudio section of the forum 
Looks like he has it worked out anyway 