How to add drivers to a windows install file / ISO

C:\> Dism /mount-wim /wimfile:C:\temp\install.wim /index:1 /mountdir:c:\mount

C:\> Dism /Add-Driver /Image:"c:\mount" /Driver:"C:\temp\x64" /Recurse

C:\> dism /unmount-wim /Mountdir:c:\mount /commit