DL:NTDEV assembled this file back in ~2020, and it was originally lost. Thankfully someone reuploaded it to the Internet Archive in August 2021.
x86: https://archive.org/download/windows-xp-efi-patch/Windows%20XP%20EFI%20Patch.iso
x64: https://archive.org/download/windows-xp-efi-patch-x64/Windows%20XP%20EFI%20Patch%20X64.iso
x64 (2): in video description about Windows XP x64 on UEFI with Secure Boot (below)
Video:
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https://www.youtube.com/watch?v=A7GygKu5WL4
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https://www.youtube.com/watch?v=-Uc5jpFbc3c
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https://www.youtube.com/watch?v=kqq87j2jJZY
How to switch XP over to winload bootloader:
https://winraid.level1techs.com/t/how-to-switch-xp-over-to-winload-bootloader/33929
How to install windows xp x64 uefi class 3:
https://www.reddit.com /r/windowsxp/comments/sq06vb/how_to_install_windows_xp_x64_uefi_class_3/
Sysprep WinXP SP2 64-bit on pure UEFI PC (no CSM):
https://msfn.org/board/topic/183810-sysprep-winxp-sp2-64-bit-on-pure-uefi-pc-no-csm/