Visual Basic

Private Const WM_KEYDOWN = &H100
Private Const WM_KEYUP = &H101
Private Const VK_BACKSPACE = &H8

Private Overloads Shared Function SendMessage(ByVal hWnd As IntPtr, _
ByVal msg As Integer, ByVal wp As IntPtr, ByVal lp As IntPtr) As IntPtr
    End Function

SendMessage(windHandle, WM_KEYDOWN, CType(VK_BACKSPACE, IntPtr), CType(&HC0510001, IntPtr))
SendMessage(windHandle, WM_KEYUP, CType(VK_BACKSPACE, IntPtr), CType(&HC0510001, IntPtr))

Public Type BROWSEINFO
    hOwner As Long                 'Handle to the owner window for the dialog box.
    pidlRoot As Long                'Address of an ITEMIDLIST structure specifying the location
                                                'of the root folder from which to browse. Only the specified
                                                'folder and its subfolders appear in the dialog box.
                                                'This member can be NULL; in that case, the namespace
                                                'root (the desktop folder) is used.
    pszDisplayName As String    'Address of a buffer to receive the display name of the folder
                                                'selected by the user. The size of this buffer is assumed to
                                                'be MAX_PATH bytes.
    lpszTitle As String                 'Address of a null-terminated string that is displayed above
                                                'the tree view control in the dialog box.  This string can be
                                                'used to specify instructions to the user.
    ulFlags As Long                    'Flags specifying the options for the dialog box.
                                                'See constants below
    lpfn As Long                        'Address of an application-defined function that the dialog box calls
                                                'when an event occurs. For more information, see the
                                                'BrowseCallbackProc function. This member can be NULL.
    lParam As Long                  'Application-defined value that the dialog box passes to the
                                                'callback function (in pData), if one is specified
    iImage As Long                  'Variable to receive the image associated with the selected folder.
                                                'The image is specified as an index to the system image list.
End Type