This is a known Windows specific problem.
Nathan was looking into it to see if we can get the real events from GHOST api.

Indeed, this is duplicate of https://projects.blender.org/tracker/index.php?func=detail&aid=23829&group_id=9&atid=498

For now, remap these functions yourself. If you input these key combinations while editing keymap you'll get the translated ones also in keymap, you should be able to use those.