I can reply for public so anyone can read and understand it.
We as the Stealth Team itself only providing the Script.dll, wich is written in Delphi.
In the past there were upcoming wishes writing Scripts in C#, Lua, Java, C++, PHP and any possible languange.
But the Focus on Stealth is Delphi, Pascal and Python, we dont provide any other dll.
However Maxwell has been updating the scriptdotnet.dll wich was contributed by persons such as Orich, Neo and Me and due his solid and frequently work, we included his dll on some points of Release.
ScriptdotNetAPI.cs was a product of Orich and me, I work on my ScriptSDK and Orich prolly stopped to play 'n code in UO\C#.
So there wont be any further release of that file unless someone update it himself and release it for public.

Hope this resolve the matter.
Regards
Crome