That "~" (tilde) file is most probably appearing as the result of
installing
the "April 2003, Cumulative Patch for Outlook Express (330994)". Microsoft
is aware of the problem and is supposedly working on a fix. Many people are
experiencing this problem and from what I've read about this problem that
icon will also reappear when you reply to an e-mail and you have your
Outlook Express set up to enter the persons e-mail address to your address
book whenever you reply to an e-mail. You can either just put up with it or
follow the uninstall directions for the patch at the link below. http://www.microsoft.com/windows/ie/downloads/critical/330994/default.asp