Nope, Plus!3 will not accept to be installed on Windows 95 and Windows NT 4, for technical reasons. However, version 2 works perfectly fine on these oldies
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As for changing the text send by /me, I can't, for backward compatibility reasons. Also, as someone already said, what it'S changed to, it will never make perfect sense (and don't forget it has to be international so for most of my users, "I" doesn't mean anything already anyway).