WiX: How to create a single MSI file containing Install wizard in multiple languages?

Question

I want to distribute my app as a single MSI file.
The install wizard must show in the user's locale, for instance French or Japanese.

QUESTION: How to achieve this with WiX?

Notes:

• light -culture generates one MSI per culture, not what I want.
• The rest of my app's localization works, single MSI. Only the installer refuses to get localized.
• I would prefer to avoid the use of undocumented MSI features as WiX warns against it.

Answer 1

Windows Installer doesn't support one .msi package having more than one language for its UI. The -cultures switch tells WiX to generate four .msi packages, one per culture.