i found a post in microsoft technet forum , where a rme soundcard user posted a link to
a firewire driver from a video camera company , works for him : http://www.qimaging.com/support/downloads/
Scroll down to the bottom of the page , or have a look at the original postings :
http://social.technet.microsoft.com/Forums/en/w8itprohardware/thread/0790f015-544f-4fb5-8cb9-db158a771e1d
There is also described a way to install win7 driver on win8 …cant try it by myself , still on win7 …