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if declared in same form replace public with private
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Option Compare Database

'Declarations
Public 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 Declare Function GetOpenFileName Lib "comdlg32.dll" Alias "GetOpenFileNameA" (pOpenfilename As OPENFILENAME) As Long

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'حيث C_NAME4 هو مربع نص يسجل به المسار
Private Sub C_NAME4_DblClick(Cancel As Integer)

    Dim ofn As OPENFILENAME
    ofn.lStructSize = Len(ofn)
    'ofn.hwndOwner = Me.Hwnd
    'ofn.hInstance = App.hInstance
    ofn.lpstrFilter = "Mdb Files (*.mdb)" + Chr$(0) + "*.mdb" + Chr$(0) + "Mde Files (*.mde)" + Chr$(0) + "*.mde" + Chr$(0)
        ofn.lpstrFile = Space$(254)
        ofn.nMaxFile = 255
        ofn.lpstrFileTitle = Space$(254)
        ofn.nMaxFileTitle = 255
        ofn.lpstrInitialDir = CurDir
        ofn.lpstrTitle = " MT Software "
        ofn.flags = 0
        Dim A
        A = GetOpenFileName(ofn)
        If (a) Then
                Me![C_NAME4] = Trim$(ofn.lpstrFile)
                'MsgBox "File to Open: " + Trim$(ofn.lpstrFile)
        Else
                MsgBox "Cancel was pressed"
        End If
    Exit Sub

CmdBrowseErrHandler:
If Err.Number = 32755 Then
 MsgBox " You did not change the file name ", 64, "Alert Message "
ElseIf Err.Number = 20477 Then
 MsgBox " Invalid file name  ", 16, "Alert Message "
Else
MsgBox Str(Err.Number) + Err.Description
End If
'Exit Sub
End Sub