Writing this to help any out who may be encountering this issue. I upgraded the ADK in my test lab this weekend, and when I imported the new boot images into the console, it failed with the following message: "The specified file can not be imported. Make sure the file is not read only and you have read and write access to it." The fix for me? Reboot after you update the ADK. Once I rebooted, I was able to successfully import the new boot WIM.