-#ifdef USE_LISP_UNION_TYPE
- info.dwItemData = (DWORD) (wv->help).i;
-#else
- info.dwItemData = (DWORD) (wv->help);
-#endif
+ {
+ /* As of Jul-2012, w32api headers say that dwItemData
+ has DWORD type, but that's a bug: it should actually
+ be ULONG_PTR, which is correct for 32-bit and 64-bit
+ Windows alike. MSVC headers get it right; hopefully,
+ MinGW headers will, too. */
+ info.dwItemData = (ULONG_PTR) XLI (wv->help);
+ }