How to Inject Registry Keys during SCCM deployment
Generally speaking it is simple to use “reg import reg name” but sometimes you want to import the registry key for 32 bit or 64 bit. so the argument /reg:32 or /reg:64 is important. Reference: https://social.technet.microsoft.com/Forums/en-US/c5df4da7-d285-4a3d-a3b4-c7dda26a06af/inject-registry-keys-during-deployment