The file name nor folder should make a difference. Even if the folder or new WIM name have spaces in them. From the DIA PE Key, if you press "F8" it will open up the Log Zipper tool. With this you can choose a location to save the ZIP file to and then send that ZIP to US_OSImaging[NAME].com. This will have all of the logs so we could look into this further. My guess is that the WIM was corrupted once moved to the USB Key, but thats just a guess at this point.  We ask that you use different USB Keys and/or USB ports is that some keys and some ports do not pass large files correctly through them. This could also end up in the tool believing the WIM file was corrupted and showing you that message that it wasn't a valid DIA image. There are no hidden files needed just the WIM file created by the Capture tool. It would have saved it to the root of your Windows partition if you didn't choose to select a different location at the time of capture. If the image restores from your other USB Drive, where you originally saved it to, the WIM should be good. And I would again lean to the copy being corrupted or the USB Key and/or port not handling the throughput solidly. Please let us know once you have those logs, and we go attempt to assist you further from here. Very interesting issue you are running into. Thanks, Gary Babcock Software Development Senior Engineer Dell | Configuration Services    Dell has created the next generation of client imaging technology.  A cost free tool that will help you quickly create a re-deployable Windows image to be sent to Dell and loaded onto your computers in our factory before they ship to your offices; it’s called Dell ImageAssist.  
So I successfully completed my first Image with Dell IA.   During the capture, I sent the WIM to a folder, on a external HDD.  I successfully restored using that external HDD and a USB bootable for recovery.   Now, I want this all on one neat thumb drive and was ready to call it a day.  I put the entire folder on a NTFS thumb drive I created with Dell IA USB creator.  I booted from this drive and attempted to do a restore from the WIM I moved from the original external.  This did not work. I moved an entire folder, including any hidden items (there weren't any) to the thumb drive, so I didn't miss anything.  The error message is as such: "Not a valid WIM file, please selelct another WIM file. File was not created with this toolset. To restore a WIM/SWM file that was not created using this toolset, use DISM.EXE provided by Microsoft." Mind you, this works perfectly fine if I pull it from the original external HDD, regardless of which thumb drive I boot into.  I see no hidden files that were planted anywhere else on this external either.    I have since tried 2x thumb drives, but this made no logical sense, it was just something Dell said to try.   I'm going to re-pull the image again in an attempt to get them to the desired location, but the EXTREMLY short 30 second windows to change the default location. I'm at a bit of a loss here and don't understand why the exact files I copied over will not work going from NTFS drive to another NTFS drive.
Moved my WIM file and folder, now the Dell IA does not recognize the WIM