Allow Extensions for game

I want to allow the player to install custom scripts (extensions) for additional functionality into my game. I got a test “extension” ready in the folder: "D:\Documents estextension.cs"

Is there a way to import and run additional scripts into my standalone?

Update:
I checked out the on the fly compiling, but I don’t know if that’s a soulution. Could it help?

http://docs.go-mono.com/index.aspx?link=N%3AMono.CSharp