Originally reported here [http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/93ebb061-d952-4650-b15c-30548a6649a8/], it appears there is a regression in msvcr90 when calling wstat on symbolic links. Before SP1 and before KB2467174, calling wstat on a symbolic link directory would return the stat result for the target. After, it results with an error (the code for "does not exist").
I've tested this only with Visual Studio 2008, because this is a bug with the VS9 CLR.
It's possible that the new behavior is correct. If so, how does one stat a symlink directory in the patched code?