Silent Build Blocked by UnrealVersionSelector on Windows

I downloaded and silently (via automation) built the UE 5 Early Access 2 source code on Linux, which worked as expected. However, when I tried to do the same thing on Windows, the Setup.bat file makes the following call, which triggers a blocking popup message asking “Register Unreal Engine file types?”

.\Engine\Binaries\Win64\UnrealVersionSelector-Win64-Shipping.exe /register

Is there any way to run this exe without any popup UI? I tried different switches and nothing works.

BTW, I also noticed a hardcoded “pause” in Setup.bat in the case of an error, which would also block a silent install.