The problem is that you are not running the server as windows/amd, you need to switch it to a windows container, once you do it you will get this response:
Client:
Version: 1.12.3
API version: 1.24
Go version: go1.6.3
Git commit: 6b644ec
Built: Thu Oct 27 00:09:21 2016
OS/Arch: windows/amd64
Experimental: true
Server:
Version: 1.12.2-cs2-ws-beta
API version: 1.25
Go version: go1.7.1
Git commit: 050b611
Built: Tue Oct 11 02:35:40 2016
OS/Arch: windows/amd64
the important part is highlighted. To switch it in windows, look in the docker app that is running, and there is the option that says " switch to Windows Container".