You can open it in VS.

In solution Explorer, right-click on the project, select Unload. The right-click again and select Edit. When you're done, right-click and Reload.

>Doubt it. If you really want to find out you could open the project file in Notepad (or something similar) and poke around to see if you can find a reference to v2.0 components but, as before, it's probably not worth it....