64 bit WinPE not showing up in WDS?

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For the missing x64 WinPE image, see this article:

 

https://technet2.microsoft.com/WindowsVista/en/library/9e197135-6711-4c20-bfad-fc80fc2151301033.mspx?mfr=true

 

You have to enable the x64 detection. From the article:

 

• x64-based client computers do not receive an x64 Windows PE boot image. This can occur if the PXE basic input/output system (BIOS) implementation of the network booting computer does not correctly identify itself as being capable of working with x64-based computers. To work around this issue, enable architecture detection in the boot programs. To do this, run this command on your WDS server:

 

WDSUTIL /set-server /architecturediscovery:yes