This article provides the information on "Recimg.exe command for creation a recovery WIM image is no longer available on new Windows based Tablets".
A previous recovery option on all Windows based tablets was removed via the Window 8.1 update that added "WIMboot" option.
The WIMboot option allows for Windows 8.1 installations in a much smaller portion of the Solid State Drive (SSD) creating more available storage space on tablets with smaller storage drives. (Installations of Windows 8.1 that took over 20 GB now can be installed in less than 8GB using WIMBoot.)
Once the WIMboot option was added by Microsoft, it was recommended to all OEM manufacturers to remove the recimg.exe image creation option.
The Dell solution to use Dell Backup and Recovery (DBAR) to create a recovery USB key or use external HDD for the external image creation.
You can also use the Microsoft Technet Library solution to create WIMBoot images by clicking this link.