As you can see in the picture below, this looks like a file dialog and folder browser. This dialog can select only folder(not file). Is this a custom control? If so, then please give me advice on how to make it. This is a Winforms application.
It is the native Vista IFileDialog based version of OpenFileDialog. With the FOS_PICKFOLDERS turned on. That option is not exposed in .NET, it isn't available on earlier versions of Windows. You can get a wrapper for it from the Windows API Code Pack, CommonOpenFileDialog.IsFolderPicker property.