Hello Robert,
the imported point is if you extract USMT you have to point to the root folder structure that should look like below, you have to point to the root USMT folder to be able to import it. You have to have both sub folder.
By the way there is an alternative of just download the USMT pack instead of the full AIK.
There is no need to install the AIK on the Mirage server.
http://www.wintools.com.au/download_usmt4.php
USMT
amd64
x86