Al usar URLDownloadToFile en VBA, estoy intentando descargar un archivo. El problema es que un archivo en blanco se está descargando. ¿Alguna idea de por qué faltan los datos?

Option Explicit 

Private Declare Function URLDownloadToFile Lib "urlmon" _ 
Alias "URLDownloadToFileA" (ByVal pCaller As Long, _ 
ByVal szURL As String, ByVal szFileName As String, _ 
ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long 

Dim Ret As Long 

Sub Sample() 
    Dim strURL As String 
    Dim strPath As String 

    strURL = "https://abc.abcabc.com/cmif-ku/reports/2012/byOwningEntity/Excel/myfilename.xls" 

    strPath = "C:\Temp\myfilename.xls" 

    Ret = URLDownloadToFile(0, strURL, strPath, 0, 0) 

    If Ret = 0 Then 
        MsgBox "File successfully downloaded" 
    Else 
        MsgBox "Unable to download the file" 
    End If 
End Sub