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Access Code Created on a 32 bit machine nor working on a 64 bit machine

Murray Brown
Murray Brown asked
I am trying to run Access VBA code created on a 32 bit machine on a 64 bit machine and the following code comes up red on the 64 bit machine.
I did not create the original code so am not sure what this code does or why it won't work on a 64 bit machine.

Declare Function aht_apiGetOpenFileName Lib "comdlg32.dll" _
    Alias "GetOpenFileNameA" (OFN As tagOPENFILENAME) As Boolean

Declare Function aht_apiGetSaveFileName Lib "comdlg32.dll" _
    Alias "GetSaveFileNameA" (OFN As tagOPENFILENAME) As Boolean
Declare Function CommDlgExtendedError Lib "comdlg32.dll" () As Long

The entire module of code is as follows. The rest of the code seems to be acceptable on the 64 bit machine

Option Compare Database

    lStructSize As Long
    hwndOwner As Long
    hInstance As Long
    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 Long
    lpfnHook As Long
    lpTemplateName As String
End Type

Declare Function aht_apiGetOpenFileName Lib "comdlg32.dll" _
    Alias "GetOpenFileNameA" (OFN As tagOPENFILENAME) As Boolean

Declare Function aht_apiGetSaveFileName Lib "comdlg32.dll" _
    Alias "GetSaveFileNameA" (OFN As tagOPENFILENAME) As Boolean
Declare Function CommDlgExtendedError Lib "comdlg32.dll" () As Long

Global Const ahtOFN_READONLY = &H1
Global Const ahtOFN_HIDEREADONLY = &H4
Global Const ahtOFN_NOCHANGEDIR = &H8
Global Const ahtOFN_SHOWHELP = &H10
' You won't use these.
'Global Const ahtOFN_ENABLEHOOK = &H20
'Global Const ahtOFN_ENABLETEMPLATE = &H40
Global Const ahtOFN_NOVALIDATE = &H100
Global Const ahtOFN_ALLOWMULTISELECT = &H200
Global Const ahtOFN_PATHMUSTEXIST = &H800
Global Const ahtOFN_FILEMUSTEXIST = &H1000
Global Const ahtOFN_CREATEPROMPT = &H2000
Global Const ahtOFN_SHAREAWARE = &H4000
Global Const ahtOFN_NOREADONLYRETURN = &H8000
Global Const ahtOFN_NOTESTFILECREATE = &H10000
Global Const ahtOFN_NONETWORKBUTTON = &H20000
Global Const ahtOFN_NOLONGNAMES = &H40000
' New for Windows 95
Global Const ahtOFN_EXPLORER = &H80000
Global Const ahtOFN_NODEREFERENCELINKS = &H100000
Global Const ahtOFN_LONGNAMES = &H200000

Function TestIt()
    Dim strFilter As String
    Dim lngFlags As Long
    'strFilter = ahtAddFilterItem(strFilter, "Access Files (*.mda, *.mdb)", _
                   ' "*.MDA;*.MDB")
    strFilter = ahtAddFilterItem(strFilter, _
                    "Access Database(*.accdb;*.accda;*.accde;*.accdr;*.accdt) ", _
                    "*.accdb; *.accda; *.accde; *.accdr; *.accdt")
    strFilter = ahtAddFilterItem(strFilter, "dBASE Files (*.dbf)", "*.DBF")
    strFilter = ahtAddFilterItem(strFilter, "Text Files (*.txt)", "*.TXT")
    strFilter = ahtAddFilterItem(strFilter, "All Files (*.*)", "*.*")

    ' Uncomment this line to try the example
    ' allowing multiple file names:

    Dim result As Variant

    result = ahtCommonFileOpenSave(InitialDir:="C:\", _
        Filter:=strFilter, FilterIndex:=3, Flags:=lngFlags, _
        DialogTitle:="Hello! Open Me!")

    If lngFlags And ahtOFN_ALLOWMULTISELECT Then
        If IsArray(result) Then
            Dim I As Integer
            For I = 0 To UBound(result)
                MsgBox result(I)
            Next I
            MsgBox result
        End If
        MsgBox result
    End If

    ' Since you passed in a variable for lngFlags,
    ' the function places the output flags value in the variable.
    Debug.Print Hex(lngFlags)
End Function

Function GetOpenFile(Optional varDirectory As Variant, _
    Optional varTitleForDialog As Variant) As Variant

    ' Here's an example that gets an Access database name.
    Dim strFilter As String
    Dim lngFlags As Long
    Dim varFileName As Variant

    ' Specify that the chosen file must already exist,
    ' don't change directories when you're done
    ' Also, don't bother displaying
    ' the read-only box. It'll only confuse people.
    lngFlags = ahtOFN_FILEMUSTEXIST Or _
    If IsMissing(varDirectory) Then
        varDirectory = ""
    End If
    If IsMissing(varTitleForDialog) Then
        varTitleForDialog = ""
    End If

    ' Define the filter string and allocate space in the "c"
    ' string Duplicate this line with changes as necessary for
    ' more file templates.
    strFilter = ahtAddFilterItem(strFilter, _
                "Access (*.accdb)", "*.accdr;*.accda")

    ' Now actually call to get the file name.
    varFileName = ahtCommonFileOpenSave( _
                    OpenFile:=True, _
                    InitialDir:=varDirectory, _
                    Filter:=strFilter, _
                    Flags:=lngFlags, _
    If Not IsNull(varFileName) Then
        varFileName = TrimNull(varFileName)
    End If
    GetOpenFile = varFileName
End Function

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 Variant, _
            Optional ByVal OpenFile As Variant) As Variant

    ' This is the entry point you'll use to call the common
    ' file open/save dialog. The parameters are listed
    ' below, and all are optional.
    ' In:
    ' Flags: one or more of the ahtOFN_* constants, OR'd together.
    ' InitialDir: the directory in which to first look
    ' Filter: a set of file filters, set up by calling
    ' AddFilterItem. See examples.
    ' FilterIndex: 1-based integer indicating which filter
    ' set to use, by default (1 if unspecified)
    ' DefaultExt: Extension to use if the user doesn't enter one.
    ' Only useful on file saves.
    ' FileName: Default value for the file name text box.
    ' DialogTitle: Title for the dialog.
    ' hWnd: parent window handle
    ' OpenFile: Boolean(True=Open File/False=Save As)
    ' Out:
    ' Return Value: Either Null or the selected filename
    Dim strFileName As String
    Dim strFileTitle As String
    Dim fResult As Boolean

    ' Give the dialog a caption title.
    If IsMissing(InitialDir) Then InitialDir = CurDir
    If IsMissing(Filter) Then Filter = ""
    If IsMissing(FilterIndex) Then FilterIndex = 1
    If IsMissing(Flags) Then Flags = 0&
    If IsMissing(DefaultExt) Then DefaultExt = ""
    If IsMissing(FileName) Then FileName = ""
    If IsMissing(DialogTitle) Then DialogTitle = ""
    If IsMissing(hwnd) Then hwnd = Application.hWndAccessApp
    If IsMissing(OpenFile) Then OpenFile = True
    ' Allocate string space for the returned strings.
    strFileName = Left(FileName & String(256, 0), 256)
    strFileTitle = String(256, 0)
    ' Set up the data structure before you call the function
    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
    ' This will pass the desired data structure to the
    ' Windows API, which will in turn it uses to display
    ' the Open/Save As Dialog.
    If OpenFile Then
        fResult = aht_apiGetOpenFileName(OFN)
        fResult = aht_apiGetSaveFileName(OFN)
    End If

    ' The function call filled in the strFileTitle member
    ' of the structure. You'll have to write special code
    ' to retrieve that if you're interested.
    If fResult Then
        ' You might care to check the Flags member of the
        ' structure to get information about the chosen file.
        ' In this example, if you bothered to pass in a
        ' value for Flags, we'll fill it in with the outgoing
        ' Flags value.
        If Not IsMissing(Flags) Then Flags = OFN.Flags
        If Flags And ahtOFN_ALLOWMULTISELECT Then
            ' Return the full array.
            Dim items As Variant
            Dim value As String
            value = OFN.strFile
            ' Get rid of empty items:
            Dim I As Integer
            For I = Len(value) To 1 Step -1
              If Mid$(value, I, 1) <> Chr$(0) Then
                Exit For
              End If
            Next I
            value = Mid(value, 1, I)

            ' Break the list up at null characters:
            items = Split(value, Chr(0))

            ' Loop through the items in the "array",
            ' and build full file names:
            Dim numItems As Integer
            Dim result() As String

            numItems = UBound(items) + 1
            If numItems > 1 Then
                ReDim result(0 To numItems - 2)
                For I = 1 To numItems - 1
                    result(I - 1) = FixPath(items(0)) & items(I)
                Next I
                ahtCommonFileOpenSave = result
                ' If you only select a single item,
                ' Windows just places it in item 0.
                ahtCommonFileOpenSave = items(0)
            End If
            ahtCommonFileOpenSave = TrimNull(OFN.strFile)
        End If
        ahtCommonFileOpenSave = vbNullString
    End If
End Function

Function ahtAddFilterItem(strFilter As String, _
    strDescription As String, Optional varItem As Variant) As String

    ' Tack a new chunk onto the file filter.
    ' That is, take the old value, stick onto it the description,
    ' (like "Databases"), a null character, the skeleton
    ' (like "*.mdb;*.mda") and a final null character.

    If IsMissing(varItem) Then varItem = "*.*"
    ahtAddFilterItem = strFilter & _
                strDescription & vbNullChar & _
                varItem & vbNullChar
End Function

Private Function TrimNull(ByVal strItem As String) As String
    Dim intPos As Integer

    intPos = InStr(strItem, vbNullChar)
    If intPos > 0 Then
        TrimNull = Left(strItem, intPos - 1)
        TrimNull = strItem
    End If
End Function

Private Function FixPath(ByVal path As String) As String
    If Right$(path, 1) <> "\" Then
        FixPath = path & "\"
        FixPath = path
    End If
End Function
Watch Question

AlexA lack of information provides a lack of a decent solution.


comdlg32.dll needs to be put into the syswow64 folder within c:\windows and then you need to register it. After that it should work


Move   comdlg32.dll to C:\windows\syswow64


Regsvr32 c:\windows\syswow64\ comdlg32.dll

See if that works



Murray BrownASP.net/VBA/VSTO Developer


Thanks Alex. I need to distribute this to several users If I an I want to avoid having to ask them to put extra files in their C drive. Is there not an alternative way to just write this code? Thanks
Software & Systems Engineer
Distinguished Expert 2019

For 64bit the syntax is : 

Declare PtrSafe Function aht_apiGetOpenFileName Lib "comdlg32.dll" Alias "GetOpenFileNameA" (OFN As tagOPENFILENAME) As Boolean

 Private Declare PtrSafe Function aht_apiGetSaveFileName Lib "comdlg32.dll" _
Alias "aht_apiGetSaveFileNameA" (OFN As tagOPENFILENAME) As Boolean
AlexA lack of information provides a lack of a decent solution.


That may work better, I took a quick look and found that you can replace the 32bit file, but try the code first and then try replacing the file.

Yes there is a way to copy it to all users of that application, we can use either group policy or a script (why not both?)



Fabrice LambertConsulting
Distinguished Expert 2017

I will suggest to enclose your declarations with compiler directives, so the right declarations will be choosen no mater the environment 32 or 64 bits):
#If VBA7 Then
    '// 64 bits déclarations goes here
    '// 32 bits déclarations goes here
#end if

Open in new window

Jim Dettman (EE MVE)President / Owner
Fellow 2019
Most Valuable Expert 2017


<<I did not create the original code so am not sure what this code does or why it won't work on a 64 bit machine.>>

 Any Windows API calls need to be checked and possibly modified for 64 bit.   Office comes in 32 or 64 bit editions now, and which you are using determines the way the call is made.

All API, ODBC, DLL's, add-in's, active-x, etc must all be updated for use with 64 bit.

Your VBA code must also be updated.    Note that it is possible to have a single DB work in both 32 and 64 bit environments via the use of compiler constants, but you cannot distribute the DB as a .ACCDE.

If you need to distribute that way, you'll need to have two different distributions.

You can read an overview of it all here:

Compatibility Between the 32-bit and 64-bit Versions of Office 2010

Make sure you read the section "Introducing the VBA 7 Code Base"

and this link:


 Gives you all the new Declare's that you would need for 64 bit.

Murray BrownASP.net/VBA/VSTO Developer


Thanks very much John. That worked well