原有vba32位的程序装的是64位的office，declare后面已经加过Ptrsafe了也不行

Question

Public Declare PtrSafe Function SetTimer Lib "user32" _
(ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerfunc As Long) As Long
Public Declare PtrSafe Function KillTimer Lib "user32" _
(ByVal hwnd As Long, ByVal nIDEvent As Long) As Long
Private Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)

Function WinProcA(ByVal hwnd As Long, ByVal uMsg As Long, ByVal idEvent As Long, ByVal SysTime As Long) As Long

End Function
KillTimer 0, idEvent
DoEvents
Sleep 100
Application.SendKeys "%s"
End Function

' 发送单个邮件的子程序
Sub SendMail(ByVal to_who As String, ByVal subject As String, ByVal body As String, ByVal attachement As String)
Dim objOL As Object
Dim itmNewMail As Object
'引用Microsoft Outlook 对象
Set objOL = CreateObject("Outlook.Application")
Set itmNewMail = objOL.CreateItem(olMailItem)
With itmNewMail
.subject = subject '主旨
.body = body '正文本文
.Bcc = to_who '收件者
.Display '启动Outlook发送窗口
SetTimer 0, 0, 0, AddressOf WinProcA
End With
Set objOL = Nothing
Set itmNewMail = Nothing
End Sub

'批量发送邮件
Sub BatchSendMail()
Dim rowCount, endRowNo
endRowNo = Cells(1, 1).CurrentRegion.Rows.Count
'逐行发送邮件
For rowCount = 1 To endRowNo
SendMail Cells(rowCount, 1), Cells(rowCount, 2), Cells(rowCount, 3), Cells(rowCount, 4)
Next
End Sub

求大神帮忙改成64位可用的群发邮件程序，不胜感激