http://bugs.winehq.org/show_bug.cgi?id=20054
--- Comment #4 from Vincent Povirk madewokherd@gmail.com 2009-09-15 04:56:59 --- Well, for whatever reason GdipGetGenericFontFamilySansSerif on Windows always returns a font family that claims to be Microsoft Sans Serif. Otherwise, we'd be seeing skips or failures in the font test on Windows.
While this doesn't prove that the font is really installed, it's the simplest explanation.