Public Type BROWSEINFO
    hOwner As Long
    pidlRoot As Long
    pszDisplayName As String
    lpszTitle As String
    ulFlags As Long
    lpfn As Long
    lParam As Long
    iImage As Long
End Type

Declare Function SHGetPathFromIDList Lib "shell32.dll" _
   Alias "SHGetPathFromIDListA" (ByVal pidl As Long, _
   ByVal pszPath As String) As Long
Declare Function SHBrowseForFolder Lib "shell32.dll" _
   Alias "SHBrowseForFolderA" (lpBrowseInfo As BROWSEINFO) As Long

Function GetDirectory(Msg) As String
    Dim bInfo As BROWSEINFO
    Dim path As String
    Dim r As Long, x As Long, pos As Integer
    With bInfo
        .pidlRoot = 0&
        .lpszTitle = Msg
        .ulFlags = &H1
    End With
    x = SHBrowseForFolder(bInfo)
    path = Space$(512)
    r = SHGetPathFromIDList(ByVal x, ByVal path)
    If r Then
        pos = InStr(path, Chr$(0))
        GetDirectory = Left(path, pos - 1)
    Else
        GetDirectory = ""
    End If
End Function

Sub Aufruf()
    s = GetDirectory("Bitte wählen Sie einen Ordner")
    MsgBox s
End Sub