.Net Framework 3.5 DLL file missing for Windows 8

[AWS]

I am running a web application that requires System.IdentityModel.dll file. This DLL file is present in Windows 7, .Net Framework 3.5 SP1, however, it is missing from Windows 8 .NetFramework 3.5. Is there a reason it was left out? How can I get that DLL
file into my assembly in Windows 8?

Could not load file or assembly 'System.IdentityModel.Selectors,
Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its
dependencies. The system cannot find the file specified.


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