No, we don't have the solution-level virtual folders. We do have the concept of these types of organization folders on the project level for organizing source files. The SlickEdit project/workspace code has been around a while, well before MSFT come up with the "anything goes" approach to folder organization. Since our project tree has to handle SlickEdit project formats as well as several 3rd party formats, it's going to take some delicate surgery to add that support without nuking everything else.