Public 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


Public Function OpenFileDialog(Optional InitialPath As String = vbNullString) As String
    Dim TFileName As OPENFILENAME
    TFileName.lStructSize = Len(TFileName)
    TFileName.hwndOwner = Application.hWndAccessApp
    TFileName.hInstance = Application.hWndAccessApp
    
    TFileName.lpstrInitialDir = InitialPath
    TFileName.lpstrFile = String( 255 ,  0 )
    TFileName.nMaxFile = Len(TFileName.lpstrFile) -  1 
    
    Dim res As Long
    res = GetOpenFileName(TFileName)
    Dim strOut As String
    strOut = TFileName.lpstrFile
    Dim lstr As Long
    lstr = InStr( 1 , TFileName.lpstrFile, Chr( 0 ))
    strOut = left(strOut, lstr -  1 )
    OpenFileDialog = strOut
End Function

Dim strTmp As String
strTmp = OpenFileDialog
If strTmp = vbNullString Then
    ' Нажали Cancel - пошли в жопу'
    Goto Zhopa
Else
    ' Выбрали файл - не пошли в жопу
    Me.SomeControl.Value = strTmp
End If