http://bugs.winehq.org/show_bug.cgi?id=18777
--- Comment #4 from Paul "TBBle" Hampson Paul.Hampson@Pobox.com 2009-06-05 20:24:44 --- Not necessarily. This isn't a Windows API feature we're looking at, we're just handling the same configuration key Windows uses to configure equivalent functionality. We don't need to match Windows configuration-for-configuration. The driving factor for this functionality isn't that Windows does it, but that Wine's Font Substitutes functionality does it, as per my commit message in comment 1.
The actual functionality we are trying to match in Windows is "fonts are able to pull glyphs from other fonts to handle other character sets" and "MS Shell Dlg font substitution behaviour based on locale"
If desired/needed, some kind of "FontLinks customised, do not rewrite" registry key would be perfectly valid. _I_ don't think such a thing is needed or desirable, so I won't be working on one. ^_^