How to script photoshop using C# .net 3.5

According to this:

http://www.pcpix.com/Photoshop/

And this:

http://lonerobot.net/?p=374

Script photoshop from .net code is an option.

But, in .net 3.5 I can't find any COM assembly with the name: Interop.Photoshop.dll.

Maybe this assembly support only .net 1.0 ?