building wix managed Custom Actions in .net 4.0

We just recently upgraded all our code base to .net 4.0, and are trying to build custom actions in开发者_如何学C our installer using .net 4.0.

We are using wix 3.5 to do that, I am getting BadImageException, saying its built using a newer version of .net runtime than currently loaded.

does wix 3.5's makesxca utility support .net 4.0 ?

Have you tried changing the <supportedRuntime> version in the CustomAction.config to "v4.0"? I didn't try myself, it is just a guess. This article is referenced as the explanation.