WIX Custom Actions built for .Net Framework 4.0 does not work? Ways to resolve?

Question

We were using WIX 3.5 (Build Number 1811) and built a custom action built using Visual Studio 2008 and with target framework as .Net 3.5. This used to work great, until we b

Answer 1

Just my two cents:

Unlike Ngm I only had to add supportedRuntime for .NET 4.0

Important:

1. Don't rename CustomAction.config
2. Set the CustomAction.config Build Action to Content, else it won't work