http://bugs.winehq.org/show_bug.cgi?id=4696
------- Additional Comments From mike@codeweavers.com 2006-12-11 21:07 ------- Sam, if you write a simple test case for ntdll.vsprintf that shows your change is correct, I will help you get the change into Wine.
Have a look at dlls/msvcrt/tests/printf.c for more information.