Hi,
Unfortunately not but if you want to you can produce it your self.
You can download the project using source code tab, this is where I have a project that produces 3.% assembly.
The way it works is that it uses files from .NET 4.0 source code and for things that do no work in .NET 3.5 it replaces file.
so you will see version specific files with .NET35 or .NET40 ending.
Hope it helps,
Thanks,
Oleg