Question

I am using WIX to automatically modify web.config files depending on the environment the user is installing. I did this using WixUtilExtension and a cutom “choose environment” dialog UI.

I was wondering if there is any possible way to make WIX modify xml files inside a XAP package such as ServiceReferences.ClientConfig file?

Answer 1

A little bit quirky, but most probably you will end up with a custom action that will:

1. Extract the XAP (as a zip file)
2. Load the ServiceReferences.ClientConfig from a temp folder
3. Update the config file with the user inputs
4. Re-zip it as XAP