(How) Does Unity3D perform sand-boxing and security?

Unity3D lets you write scripts in C# which are (IIRC) run through the mono framework on PCs with the Unity player installed. How does Unity3D sand-box this - I assume they must do - to prevent a malicious site trying to delete your files or开发者_JAVA百科 report data back to a server about you and your PC?

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The Unity Player runs it's own version of the Mono runtime that doesn't include file system access.

There's a massive (10MB) list of what Mono/.Net classes are available for each supported platform.

http://unity3d.com/support/documentation/ScriptReference/MonoCompatibility.html