Cannot build a Win10 UWP Unity 5.2 project in VS2015 (14.0.23107.0 D14REL). Cannot resolve Assembly or Windows Metadata file 'System.Runtime.dll' Here is what is included in the csproj file that gets created from Unity: <Reference Include="System.Runtime"> <HintPath>C:\Users\[MYLOGIN]\.nuget\packages\System.Runtime\4.0.20\ref\dotnet\System.Runtime.dll</HintPath> </Reference> The file exists at that location. In VS2015, in the Object Browser, I can see System.Runtime and the Assembly location is the same as the <Reference Include...> above. I tried uninstalling the Windows SDK 10.0.26624 and reinstalling but it had no effect. Any idea how I can resolve this reference issue and get the project to build in VS?