Microsoft makes horribly insecure products, so to protect themselves from having arbitrary code execute in their e-mail program, they just block most anything from being opened altogether. Even if you know what you're doing, and you want the attachment, you can't get at it without hacking your registry. Damn you Microsoft!
But it looks like that registry hack only works for Outlook 2002, and there's really no good way to get around the hack that they put in to block you from getting your own file. Grrrr...
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