Not sure how his email would get spam, Stardock does not do that. On his current profile he does not have email showing, so nobody here could spam it. The address he has listed as homepage takes me to Microsoft.
As for the post, when edit image that is tga converted to png to edit, after save changes in Paint.net, must save changes in SkinStudio to convert png back to tga. Will get a message box about tga about to be replaced, this is the old one, before edit, click yes to delete, reaplly skin edit is done. When edit a bitmap a save is not needed, but when tga you are actually making a new image this is why must save change in SkinStudio. The old tga stays in folder just the converted png opens in Paint.net.