Use a flag to test if create structure is unicode.

include/user.h

diff --git a/include/user.h b/include/user.h
index 51d45ac..8d0355d 100644
--- a/include/user.h
+++ b/include/user.h
@@ -69,7 +69,7 @@
     void   (*pResetSelectionOwner)(struct tagWND *, BOOL);
 
     /* windowing functions */
-    BOOL   (*pCreateWindow)(HWND,CREATESTRUCTA*);
+    BOOL   (*pCreateWindow)(HWND,CREATESTRUCTA*,BOOL);
     BOOL   (*pDestroyWindow)(HWND);
     BOOL   (*pGetDC)(HWND,HDC,HRGN,DWORD);
     BOOL   (*pEnableWindow)(HWND,BOOL);