I'm not positive on the finalizing, but I think when you burn an ISO, it's an image, so it's most likely going to be automatically finalized. And regarding the appearance of the icon, that depends on which program has laid claim to the .ISO extension as to how it will look.
Yes, it is using a default XP icon since it doesn't have an association. Change the icon to whatever you want, if you want to, but don't worry about it.
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