Unit viewer and Win 8

[Crossroads]

I don't have the answer for W8 compatibility, but would just recommend you to install the mod using JSGME utility. That way, you can enable and disable the sound mod at your will, and can easily experiment which new sounds you add to the system (via having them in the mod folder), and which not.

If you're not familiar with JSGME there's pretty comprehensive info with further links in the installation instruction thread of the EF:FB mod, link available in my signature down below.