The extenders connect to Win 7...haven't tried Win8 CP, not even sure it's possible and after playing with Win8 for 15 mins or so decided it truly lived "down" to the negative press and powered down the vm.
As for getting Win8 to install and Windows 7 to work with extenders, as I said I can't say for certain which specific step/steps are absolutely required, but here's everything I did:
First, I upgraded my ESXi 5 build with "patch 2" here and the subsequent update from 3/15 on the vmware support site. See this link for details/instructions: VMware Communities: Windows 8 Consumer Preview runs fine on...
Next, I installed the "HD Audio" device, which requires manually editing the vmx file as outlined here: Virtual HD Audio Hardware in vSphere 5 « Virtualization.BlogNotions - Thoughts from Industry Experts
Finally, I updated the VMWare Tools. The updater in Windows 7 system tray wouldn't work right away -- said I needed to edit the vmx file and provided the line to add, which I did. Just click on the VMWare tools in the tray, choose update, and follow the instructions if it complains like mine did.
At this point I was able to watch HD & SD recorded and live tv (HD Homerun Prime CC) without a problem...EXCEPT for the aforementioned issue with skip/ffwd/rew which I'm still looking for answers on.
Good luck and hope this helps!