And in this day and age I can't actually imagine that 'anything' would break... It's not like ANSI support would go away, they'd just change their save dialogs to default to UTF8 and all newly saved text files going forward would suddenly have a BOM and work on every PC on the planet - files without a BOM will still open as ANSI....
The occasional Windows 95 era program that actually didn't understand a UTF-8 BOM would still render 98% of the text correctly for a western language.. I imagine in Asia there may be some workflows that assume gb2312/shift-JIS/big5 etc as the default, but you could even keep a registry setting around for people who insisted on staying in the dark ages.
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