Support Windows Server Core without WoW64 support

[wixbot]

It looks like the WiX extensions fail on executing when the target system does not include the WoW64 support.

Invoking remote custom action. DLL: C:\Windows\Installer\MSI5B3C.tmp, Entrypoint: ConfigureIIs
MSI (s) (94:34) [08:33:46:793]: Generating random cookie.
MSI (s) (94:34) [08:33:46:793]: Failed to create Custom Action Server. Error 308.

Can you change that so it can be running without WOW64 installed? Thanks TomasK

Originally opened by tomask

[wixbot]

Could do custom actions only in v3.x; the Burn change is v4 only, because we currently swap in the x86 burn stub.

Release changed from v3.8 to v4.0

[wixbot]

Type changed from Bug to Feature

[rseanhall]

I guess we're using this issue for ARM/ARM64 Custom Actions as well as pure x64 Custom Actions. ARM/ARM64 custom actions are already in v3.14. x64 Burn is tracked at #4579.

[barnson]

Custom actions are implemented. x64 Burn is tracked at #4579.

[rseanhall]

@barnson Dependency.wixext only has x86. I didn't check all of them, so maybe others as well.

[barnson]

@rseanhall [citation needed] I see all three platforms in the compiler extension, CA, and wixlib.

[rseanhall]

I was looking at the .sln, which I guess doesn't matter. https://github.com/wixtoolset/Dependency.wixext/blob/master/Dependency.wixext.sln

[barnson]

And appveyor.cmd only builds the extension DLL, which is a little weird compared to other projects, but the project references mean it all works.

[rseanhall]

@barnson Fine. You made me look. VisualStudio, Msmq, DirectX all x86 only. COM+ only x86/x64. UI looks almost correct, but wixlib project is only referencing the CA project once so not sure how that's working. DifxApp also not building the CA in the wixlib project.

[barnson]

VisualStudio is explicitly correct because VS itself is x86-only. When it goes x64/ARM64, I'll worry. UI is problematic because the CAs are implicitly referenced; it really needs a compiler extension so we can control the CA references. DifxApp is special because we don't own/build the CAs, so they have to be added explicitly via the .wixlibs. The rest are legit, albeit boring.

[barnson]

Tracking todos in #5933.