I've got an interesting one, more of a comment that a bug (so far).
With the image linked above, my Z (C750) is at least recognised by WinXP, but as "RNDIS/Ethernet Gadget", for which it can find no drivers (locally - i.e. on the installation disks).
I just did a quick google for RNDIS, and I suppose it ought to work as the driver seems to have been written for the purpose of keeping Windows' CDCEther implementation happy (I only read it quickly, I may have got the wrong end of the stick), I'll see if Windows update will turn up the drivers. If not, this is an issue as some people do still have to use Windows.
Si