I installed IronPython 2.6.1 on Windows Vista x64 on a machine with Visual Studio 2010 installed. I expected to find these DLLs:
Microsoft.Scripting.Core.dll
I have 2.6.1 for .NET 4.0 installed and those assemblies are not available since, if I'm not mistaken, they were integrated into .NET 4.0 System.Core.
System.Core
Those assemblies are still available in the .NET 2.0 version of IronPython 2.6.1.