You will/may need: Windows Vista ISO, a USB 8GB or larger, a system with UEFI and secure boot disabled, Rufus, another laptop with USB SATA cable or Linux run from USB on the Windows Vista computer (if no USB SATA).
1. Grab a Vista ISO from here:
https://board.eclipse.cx/viewtopic.php?f=10&t=333.
2. Burn the ISO to USB 8GB or larger with Rufus as GPT.
3. Go here and follow this guide:
https://vinaypundith.github.io/windows_7_efi_guide/
3A. You do not need a third party program to mount the EFI drive from within an existing Windows installation if you have a USB SATA cable. To mount it, search for CMD within the Start Menu, right click it, run as administrator, and then run the following commands. Do not add in the items within the () such as (efi part) and (replace b with your desired drive letter).
diskpart
sel disk 0
sel part 1 (efi part)
assign letter=b (replace b with your desired drive lettter)
exit
taskkill /im explorer.exe /f
explorer.exe
Your drive should be now mounted. This is much easier than using Linux or a third party tool to view it. You may run into an issue where this may not work if you run this command on Windows 10. 7 and 8.1 will for sure work! Credit to superuser for this nifty command:
https://superuser.com/questions/965751/how-to-access-efi-partition-on-windows-10
4. You have Windows Vista on UEFI mode! Congrats!
5. Now finish the setup with the Vista Extended Kernel, which you can learn how to setup here:
https://board.eclipse.cx/viewtopic.php?f=10&t=333