This is based on https://github.com/kud/apple-french-keyboard-windows. I used the Microsoft Keyboard Layout Creator 1.4 (https://www.microsoft.com/en-gb/download ...

In Yosemite, the menu is under Keyboard > Input Sources, then add, then the layouts should be under Others at the bottom of the list on the left. As you can imagine those files are provided "As is" ...