It takes three step:
Step 1
Open solution file (.sln) in a text editor and change
Microsoft Visual Studio Solution File, Format Version 12.00
to
Microsoft Visual Studio Solution File, Format Version 11.00
Step 2
Open application configuration file (App.config) in a text editor and change
sku=".NETFramework,Version=v4.5"
to
sku=".NETFramework,Version=v4.0"
Step 3
Open project file (for C# language .csproj) in a text editor and change
<TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
to
<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
Now enjoy your project in VS 2010 !
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