word 2000 (9.0.44.02 SR-1)
wordpad/notepad v5.0 (Build 2195: Service Pack 3)
msn messenger 4.6.0082
and so on and so forth. If I need a tilde in an URL (or in a post here) I have to type ~ and then space, at least when the next character is ‘tildeable’, like ã ñ õ…
And if you search for ‘typing accents’ on the net you’ll find out how to configure windows to accept this type of input from american keyboards as well.