wix extension's custom action fail with 1157 when x64 MSI is executed on Windows 11 ARM

[martinh2011]

Question

We had an x64 MSI built with wix 3.14 which could be executed on Windows 11 ARM. After migrating to wix v6 CA from wix extensions like the WixToolset.Netfx.wixext fail with error 1157:

Action 10:44:07: Wix4NetFxScheduleNativeImage_X64. 
Action start 10:44:07: Wix4NetFxScheduleNativeImage_X64.
MSI (s) (44:84) [10:44:07:590]: Creating MSIHANDLE (154) of type 790542 for thread 11396
MSI (s) (44:78) [10:44:07:590]: Invoking remote custom action. DLL: C:\WINDOWS\Installer\MSI343E.tmp, Entrypoint: SchedNetFx
CustomAction Wix4NetFxScheduleNativeImage_X64 returned actual error code 1157 (note this may not be 100% accurate if translation happened inside sandbox)
MSI (s) (44:78) [10:44:07:590]: Closing MSIHANDLE (154) of type 790542 for thread 11396
MSI (s) (44:84) [10:44:07:590]: Note: 1: 1723 2: Wix4NetFxScheduleNativeImage_X64 3: SchedNetFx 4: C:\WINDOWS\Installer\MSI343E.tmp 
Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor. Action Wix4NetFxScheduleNativeImage_X64, entry: SchedNetFx, library: C:\WINDOWS\Installer\MSI343E.tmp 
MSI (s) (44:84) [10:44:12:683]: Product: SwyxIt! -- Error 1723. There is a problem with this Windows Installer package. A DLL required for this install to complete could not be run. Contact your support personnel or package vendor. Action Wix4NetFxScheduleNativeImage_X64, entry: SchedNetFx, library: C:\WINDOWS\Installer\MSI343E.tmp 

Action ended 10:44:12: Wix4NetFxScheduleNativeImage_X64. Return value 3.

The old wix v3 based MSI also used this extension and works on Windows 11 ARM, probably via Windows x64 emulator.

Any idea why this no longer works with MSIs build with wix v6 and how I can fix it?

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[robmen]

Hmm, CustomAction Wix4NetFxScheduleNativeImage_X64 suggests that you're getting x64 custom actions, not ARM64 actions. I'd start your investigation by figuring out why that happened.