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VB code:

Option Explicit

Private Declare Function GetOpenFileName Lib "comdlg32.dll" Alias _
"GetOpenFileNameA" (pOpenfilename As OPENFILENAME) As Long

Private Type OPENFILENAME
lStructSize As Long
hwndOwner As Long
hInstance As Long
lpstrFilter As String
lpstrCustomFilter As String
nMaxCustFilter As Long
nFilterIndex As Long
lpstrFile As String
nMaxFile As Long
lpstrFileTitle As String
nMaxFileTitle As Long
lpstrInitialDir As String
lpstrTitle As String
flags As Long
nFileOffset As Integer
nFileExtension As Integer
lpstrDefExt As String
lCustData As Long
lpfnHook As Long
lpTemplateName As String
End Type
Const OFN_ALLOWMULTISELECT = &H200
Const OFN_EXPLORER = &H80000
Const OFN_PATHMUSTEXIST = &H800
Const OFN_FILEMUSTEXIST = &H1000

Private Sub Command1_Click()
Dim OpenFile As OPENFILENAME
Dim lReturn As Long
Dim sFilter As String
OpenFile.lStructSize = Len(OpenFile)
OpenFile.hwndOwner = Me.hWnd
OpenFile.hInstance = App.hInstance
sFilter = "All Files(*.*)" & Chr(0)
OpenFile.lpstrFilter = sFilter
OpenFile.nFilterIndex = 1
OpenFile.lpstrFile = String(1000000, 0)