Pon el siguiente código en un formulario:
RichTextBox1.Text = Module1.GetFolder(Form1.hWnd, "Select folder")
En un módulo:
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
Const BIF_RETURNONLYFSDIRS = &H1
Const BIF_DONTGOBELOWDOMAIN = &H2
Const BIF_STATUSTEXT = &H4
Const BIF_RETURNFSANCESTORS = &H8
Const BIF_BROWSEFORCOMPUTER = &H1000
Const BIF_BROWSEFORPRINTER = &H2000
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
Function GetFolder(ByVal hWndOwner As Long, ByVal sTitle As String) As String
Dim bInf As BROWSEINFO
Dim RetVal As Long
Dim PathID As Long
Dim RetPath As String
Dim Offset As Integer
bInf.hOwner = hWndOwner
bInf.lpszTitle = sTitle
bInf.ulFlags = BIF_RETURNONLYFSDIRS
PathID = SHBrowseForFolder(bInf)
RetPath = Space$(512)
RetVal = SHGetPathFromIDList(ByVal PathID, ByVal RetPath)
If RetVal Then
Offset = InStr(RetPath, Chr$(0))
GetFolder = Left$(RetPath, Offset - 1)
End If
End Function
Con esto te aparecerá el selector de carpeta de windows.
Saludos.