@olivierlambert is spot on. Manage expectations. The best thing we can do is contribute helpful information.
Here is what I was able to deduce when this issue came up.
When creating a Windows VM in uefi mode and using the floppy_file option in packer:
- There is a disk added as "fda"
- However the fda device is not available as the a: drive or any other drive letter. When booted using bios mode, you can find the fda device by settting drive letter to "a:".
This is likely because uefi typically does not support floppy disks. I believe in VMWare when the floppy_file option was used in UEFI mode, it added the ISO as a DVD drive instead of an FDA.
Not sure if this is best solved at the Packer level or if it should be intercepted and corrected XCP-ng level?