How to use C# Class Libraries (dll) in Python

So with the dll attrached I tried this:
RhinoTools.zip (1.8 KB)

import sys
import clr

sys.path.append('C:\Temp')
clr.AddReference('RhinoTools')

import RhinoToolsGeometry
print(RhinoTools.RhinoToolsGeometry.TestMethod("NameA", "NameB"))

Which leads me to the following error:

Could not load file or assembly 'System.Runtime, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
Traceback:
  line 4, in <module>, "C:\Users\TSTOLT~1\AppData\Local\Temp\TempScript.py"