Fix this code for 64 bit

Private Declare Function ShellExecute Lib "shell324dll" _
Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, _
ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, _
ByVal nShowCmd As Long) As Long


Sub SendEMail()
    Dim Email As String, Subj As String
    Dim Msg As String, URL As String
    Email = Cells(ActiveCell.Row, 10)
        
    Subj = Cells(ActiveCell.Row, 4)


    Msg = ""
    Msg = Msg & "Dear " & Cells(ActiveCell.Row, 1) & "," & vbCrLf & vbCrLf & "Here is some precanned text before the BODY info in the spreadsheet. " & vbCrLf & vbCrLf & Cells(ActiveCell.Row, 13) & vbCrLf & vbCrLf & " And here is some more precanned text in the macro AFTER the Body stuff."
    
    'Replace spaces with %20 (hex)
    Subj = Application.WorksheetFunction.Substitute(Subj, " ", "%20")
    Msg = Application.WorksheetFunction.Substitute(Msg, " ", "%20")
    
    'Replace carriage returns with %0D%0A (hex)
    Msg = Application.WorksheetFunction.Substitute(Msg, vbCrLf, "%0D%0A")
    
    'Create the URL
    URL = "mailto:" & Email & "?subject=" & Subj & "&body=" & Msg
    
    'Execute the URL (start the email client)
    ShellExecute 0&, vbNullString, URL, vbNullString, vbNullString, vbNormalFocus
    
    'Wait two seconds before sending keystrokes
    'Application.Wait (Now + TimeValue("0:00:02"))
    'Application.SendKeys "%s"
End Sub