Windows Insiders will begin noticing a “pizza” icon on the command bar in File Explorer. This icon denotes that an Insider is previewing the Windows App SDK version of File Explorer. Functionality in File Explorer remains unchanged, it just switches from using WinUI 2 to using WinUI 3.
Only if it's updated (winre.wim) that's [DELETED] folder only contain deleted winpeshl.ini, not worth optimization
In builds 23xxx starting from 23403, IoTEnterpriseSK edition is not available in product.ini, pkeyconfig and basebrd.dll It's now only present in 25xxx builds.