http://bugs.winehq.org/show_bug.cgi?id=10767
--- Comment #14 from Dmitry Timoshkov dmitry@codeweavers.com 2009-11-16 13:25:42 --- (In reply to comment #13)
However, that's not the same as language independent *collation*: et_EE locale is a prime example that it doesn't work even in ASCII range.
Unicode introduces completely locale/language independent collation. That's the whole point of unicode.
The source of this bug is in the incompatibility of unicode.org and Microsoft collation tables, there is no need to add more confusion or speculation than there is already.