Nuget.core.dll file is part of NuGet.Core product developed by NuGet. It is responsible for Microsoft Corporation functionality. This part is required for NuGet.Core to function. If you are planning on replacing nuget.core.dll with a new version make sure that you backup your old file. Replacing nuget.core.dll file with a diffent version can cause NuGet.Core to malfunction.
|Dll file name
|Program Files (x86) Microsoft ASP.NET ASP.NET Web Pages v2.0 Assemblies
|Program Files (x86) Common7 IDE Extensions t5ftv5ul.s5m
|Windows Microsoft.NET assembly GAC_MSIL NuGet.Core