"a media driver your computer needs is missing"

I have made mixed ISOs since then, and in my experience it still applies.

Code from autorun:

Code:

[AutoRun.Amd64]
open=setup.exe
icon=setup.exe,0

[AutoRun]
open=sources\SetupError.exe x64
icon=sources\SetupError.exe,0

 

From what I know, a 64bit media will not work (boot) on a system with an x86 only CPU. You need to use 32bit boot files. Of course, there could be problems with UEFI boot, then.
Using 64 media will work on all machines with 64bit a capable CPU.

 

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Try taking UEFI boot into the equation.

 

I haven't checked how it's done in multi_arch_iso.cmd but result looks similar. BIOS / UEFI bootable ISO with both architecture selection screen (no setup.exe depency).

 

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