Unable to open the specified WIM file. ---> System.Exception: Unable to open the specified WIM file

MDT

FIX: 

The workaround is to copy amd64 folder (default path is C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\Windows Preinstallation Environment) and then change the name to x86.

Solution 2 : Install ADT for Windows 10 2004 and PE Add ons, it worked for me.