That icon was made in "Microangeleo", a centuries-old icon builder program that I ran as a trial demo on one of my old machines. XP was still a twich in Bill Gates bank account back then. These days, I don't have any program that can do icon transparency. If someone can suggest something, I'd give it a try. If icon transparency is so important, I probably should give the treatment to all of the icons on my site.
Of course, I would rather eat a toad than acutally use XP. I stopped at Win 2K and will be staying there until there is some real, compelling reason to give up all of my privacy for the latest operating system. That, and I can't stand the XP look and feel. The helpful popups telling you that you've connected to a network, inserted some media, or pressed a key drive me nuts.