SCROLL_BAR_PACK   518 src/w32term.h  #define SCROLL_BAR_PACK(low, high) (XFIXNUM (high) << 32 | XFIXNUM (low))
SCROLL_BAR_PACK   526 src/w32term.h  #define SCROLL_BAR_PACK(low, high) ((UINT_PTR)(XFIXNUM (high) << 16 | XFIXNUM (low)))