The official game.ai disappeared long time ago. Since then the official game.png was edited with raster image editors. So unfortunately there is no official game vector graphic.
Teekilla already linked to the discussion about redrawing the weapons on your own and that it helps you to learn how inkscape and teestyle works.
Besides, if you just want to change the hook you don't need to redraw the other graphics. Just use a raster image editor to cut the hook.
Antoine de Saint Exupéry: It seems that perfection is reached not when there is nothing left to add, but when there is nothing left to take away.
Besides - I am the gfx guy!