How to place an image pulled from a thin client from WDM onto a USB key for push?

Using the Dell Wyse USB Imaging Tool (v2.0.9.15) and selecting image push, I see that I must select either a .rsp or .xml file.  If you pull an image from a device using WDM, neither file is created.  Does this mean I am unable to use a USB key to push an image pulled using WDM or is there still a way to accomplish this?  Can only images pulled from a USB key be subsequently pushed out (or Wyse-built images that contain a .rsp file)?  Any assistance on this is greatly appreciated.