How to open project folder from Visual Studio in Windows Explorer?

Open the Solution Explorer >> right-click your project >> select Open Folder in Windows Explorer.

This has been tested on Visual Studio 2010. It will probably work in any other Visual Studio with a Solution Explorer.

See screenshots:

The easiest way...

I map a key chord to the command

Unfortunately, this only works when a project node is selected, probably because solution folders aren't actually folders and therefore it cannot be guaranteed that they actually match a folder in the file system.

You can open some of Soluion Explorer's items (folders, projects, solutions) in File Explorer by it's right click menus subitem "Open Folder in File Explorer".

Also you can open opened documents containing folder by right click opened documents tab and "Open Containing Folder".