[WiX4] WixUIExtension support

[jan-tosovsky-cz]

I am getting this error when trying to build an installer with a decent UI:

wix build -ext WixUIExtension installer.wxs
wix.exe : error WIX0144: The extension 'WixUIExtension' could not be found. Checked paths: WixUIExtension

Is this feature available in WiX4-preview.0 or it needs to be activated differently?

Without that cmdline option there are different errors:
installer.wxs(50) : error WIX0094: The identifier 'Dialog:PrepareDlg' could not be found. Ensure you have typed the reference correctly and that all the necessary inputs are provided to the linker.

[rseanhall]

The only documentation available on using extensions with wix.exe right now is this design document: https://wixtoolset.org/development/wips/6184-command-line-extension-acquisition-and-cache/

[jan-tosovsky-cz]

I finally could add this extension by this command: wix extension add WixToolset.UI.wixext
Now it is listed properly:

>wix extension list
WixToolset.UI.wixext 4.0.0-preview.0

But when building my installer that extension option seems to be ignored:

>wix -ext WixToolset.UI.wixext build installer.wxs
wix.exe : error WIX0144: The extension 'WixToolset.UI.wixext' could not be found. Checked paths: WixToolset.UI.wixext

However, when specifying the absolute path, it works:
wix build -ext C:\my-project\.wix\extensions\WixToolset.UI.wixext\4.0.0-preview.0\tools\WixToolset.UI.wixext.dll installer.wxs

[rseanhall]

That's a bug: #6536