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Just giving my two cents. What I can tell OP is that in terms of legacy software compatibility, even very old software from Windows XP...

Okay, I got it! Here's what I did: >Mounted boot.wim using dism >Loaded <path_to_mounted_image>\Windows\System32\config\SYSTEM hive...

I'm perfectly willing to use this approach. The only problem, is that I'm a bit of a noob when it comes to editing offline registry...

By the way, a bit of googling shows other people who had the same issue in the past, as far back as with Windows Server 2008 R2. No...

Yes, I've seen and even bookmarked this. This is the biggest head-scratcher. According to MS's documentation, this shouldn't be hapenning.

I managed to enable the legacy setup, using the winpeshl.ini in boot.wim method. Unfortunately, using the legacy setup didn't fix any...

Good to know. As for the standard place, unless it's supposed to have been changed, I thought it was \Windows\Panther? At least that's...

I see. Looks like I'll have to mess with the boot.wim to force legacy setup then? Bummer. Wonder if using legacy setup can fix the...

Update: It really was a parsing or formatting error! Windows is really finicky about this. I decided to use SIM to recreate the answer...

I have tried using the legacy Setup (loading it before the other commands in load order), but same thing happened: Either way, I'm...

When I meant reboot loop, I thought I had explained pretty clearly: I mean when booting from a newly created .iso with the...

Thanks, but this is exactly one of the things I already tried, as I detailed in step 3: The only thing I haven't tried is moving it to...

Since the Windows 8 days and with multiple Windows 10 builds up to 22H2, I've always been building custom sysprepped, generalized...