Thanks Kovid,
You are correct. However, changing the interface font to Unifont is a terrible price to pay, since the font is totally unhinted and is almost illegible at 8 points. (And now that I've changed the default font away from "ms shell dlg 2", there doesn't seem to be any way to get it back.)
On Windows the font fallback scheme only seems to involve specially selected Microsoft fonts, so there are lots of holes in the special character tables.
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