I am running VS2010 and have Expression Blend 3 installed.
I select a file, MainPage.xaml and select the option “Open in Expression Blend.”
Expression Blend 3 is opened and my associated web application “SilverApplication1.Web” is displayed in the project explorer with the error “Unsupported project.”
Any idea why?
You must be using Silverlight 4. Try downgrading to 3. Not sure if Expression Blend supports 4 yet. You may try the pre release beta of Expression 4.