I have work with the .NET Framework Profile78. 78 appears to be a combination of .NET 4.5, Windows Phone 8, and .NET applications for Windows Store applications.
The easiest way is to update the .csproj file, replacing the existing TargetFrameworkVersion and TargetFrameworkProfile tags with the following:
<TargetFrameworkVersion>v4.5</TargetFrameworkVersion> <TargetFrameworkProfile>Profile78</TargetFrameworkProfile>
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