vb.net project references framework 2 and 3.5

I have not changed any of the system references for my vb.net project. It is set to target framework 3.5 However, when I review the System references, they're a mixed bag of framework 2 and 3.5. Shouldn't they all be 3.5?

For example, the System reference is 2.0, the System.Core reference is 3.5.

Any explanation?

Who is Participating?
Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
2.0 and 3.5 are part of the same core version of the framework. 3.5 is really just a bolt-on to 2.0, rather than being an independent version in its own right. Therefore, any assemblies introduced with 3.5 will be marked as 3.5, but any core assemblies that shipped with 2.0 will still show as 2.0.

Hope that makes sense :)
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