[AC-2013] Migration 64 bits - Openbox ne fonctionne pas

Salut à tous,

Je dois faire tourner mon application Access sous Access 64 bits.

J'ai donc ajouté a mes appels api le PtrSafe et sur quelques variable le LongPtr recommandé sur toutes pages sur le sujet.
Mon application démarre bien, mais je n'arrive pas à ouvrir une open box pour choisir un fichier Excel.

Pourriez-vous m'aider?, je sèche !!!

Code:

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Type tagOPENFILENAME
    lStructSize As Long
    hwndOwner As LongPtr
    hInstance As LongPtr
    strFilter As String
    strCustomFilter As String
    nMaxCustFilter As Long
    nFilterIndex As Long
    strFile As String
    nMaxFile As Long
    strFileTitle As String
    nMaxFileTitle As Long
    strInitialDir As String
    strTitle As String
    Flags As Long
    nFileOffset As Integer
    nFileExtension As Integer
    strDefExt As String
    lCustData As LongPtr
    lpfnHook As LongPtr
    lpTemplateName As String
    pvReserved As LongPtr
    dwReserved As Long
    FlagEx As Long
End Type
 
Declare PtrSafe Function aht_apiGetOpenFileName Lib "comdlg32.dll" _
    Alias "GetOpenFileNameA" (OFN As tagOPENFILENAME) As Boolean
 
Function ahtCommonFileOpenSave( _
            Optional ByRef Flags As Variant, _
            Optional ByVal InitialDir As Variant, _
            Optional ByVal Filter As Variant, _
            Optional ByVal FilterIndex As Variant, _
            Optional ByVal DefaultExt As Variant, _
            Optional ByVal FileName As Variant, _
            Optional ByVal DialogTitle As Variant, _
            Optional ByVal hwnd As LongPtr, _
            Optional ByVal OpenFile As Variant) As Variant
 
 
With OFN
        .lStructSize = Len(OFN)
        .hwndOwner = hwnd
        .strFilter = Filter
        .nFilterIndex = FilterIndex
        .strFile = strFileName
        .nMaxFile = Len(strFileName)
        .strFileTitle = strFileTitle
        .nMaxFileTitle = Len(strFileTitle)
        .strTitle = DialogTitle
        .Flags = Flags
        .strDefExt = DefaultExt
        .strInitialDir = InitialDir
        ' Didn't think most people would want to deal with
        ' these options.
        .hInstance = 0
        '.strCustomFilter = ""
        '.nMaxCustFilter = 0
        .lpfnHook = 0
        'New for NT 4.0
        .strCustomFilter = String(255, 0)
        .nMaxCustFilter = 255
    End With
 
 
    If OpenFile Then
        fResult = aht_apiGetOpenFileName(OFN)
    Else
        fResult = aht_apiGetSaveFileName(OFN)
    End If

Voici en partie mon code, je ne vois vraiment pas pourquoi rien ne se passe.

Avec le meme code en 32 bit cela fonctionne très bien

Merci à vous