Results 2 comments of toreaurstad

Also same error InvalidParameter name: Index" in Visual Studio 2015 Update 3 with Wix Library project. Unloading wixlib project allows opening the extension.

![image](https://user-images.githubusercontent.com/8312552/50407957-4bf71c80-07e2-11e9-898d-1f253eefaf75.png) Example - Playing around with CSS flexbox and Roboto fonts- the text in the preview looks coarse.