Unable to open project in Expression Blend (since you are using VS2010 with .NET 4)

If you get the following problem in Expression Blend 3.0.1927.0: “Unsupported project”

image
Figure: Error messages in Expression Blend

 

Add the following pieces manually to your project file (.proj)

<PropertyGroup Condition="'$(MSBuildToolsVersion)' == '3.5'">
  <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
</PropertyGroup>

and (not sure if that is actually needed…)

<ExpressionBlendVersion>3.0.1927.0</ExpressionBlendVersion>

 

image
Figure: Applied changes to the .proj file

 

Reason: Expression Blend is not .NET 4 aware, so it needs this switch at the top of the project file

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