I had a play with this and it appears to work OK on western language Windows 10 64 bit versions, set the flag MFT_RIGHTORDER which turns around the menu layout to right to left languages like Arabic and Hebrew then re-arrange your menu topics in reverse order and you get a western type menu that is right justified rather than left justified.
100 MENUEX
BEGIN
POPUP "&Help", ,MFT_RIGHTORDER, 0
BEGIN
MENUITEM "About\tF1", 300
END
POPUP "&Edit", , , 0
BEGIN
MENUITEM "&Undo\tCtrl+Z", 200
MENUITEM "&Redo\tCtrl+Y", 201
MENUITEM "", , MFT_SEPARATOR
MENUITEM "&Cut\tCtrl+X", 202
MENUITEM "Copy\tCtrl+C", 203
MENUITEM "&Paste\tCtrl+V", 204
MENUITEM "", , MFT_SEPARATOR
MENUITEM "Clear\tDel", 205
END
POPUP "&File", , , 0
BEGIN
MENUITEM "&New", 101
MENUITEM "", , MFT_SEPARATOR
MENUITEM "&Open", 102
MENUITEM "", , MFT_SEPARATOR
MENUITEM "&Save", 103
MENUITEM "", , MFT_SEPARATOR
MENUITEM "&Exit", 125
END
END