The documentation I found for configuring IIS with Silverlight doesn't seem to work in my case. After creating the Devsamples virtual directory and creating the Mime types below, I received a type error in the web config. This was resolved by deleting the devsamples directory and specifying the directory name as Quickstarts instead. I also had to set the ASP.NET extensions to 2.0.
Managed Jscript file
.NET Symbols file