Function LoadFile(ByVal File)
    Dim objStream
    On Error Resume Next
    Set objStream = Server.CreateObject("ADODB.Stream")
    If Err.Number=-2147221005 Then
        Response.Write "<div align='center'>非常遗憾,您的主机不支持ADODB.Stream,不能使用本程序</div>"
        Err.Clear
        Response.End
    End If
    With objStream
        .Type = 2
        .Mode = 3
        .Open
        .LoadFromFile Server.MapPath(File)
        If Err.Number<>0 Then
    Response.Write "<div align='center'>文件<font color='#ff0000'>"&File&"</font>无法被打开，请检查是否存在!</font></div>"
    Err.Clear
    Response.End
        End If
        .Charset = "GB2312"
        .Position = 2
        LoadFile = .ReadText
        .Close
    End With
    Set objStream = Nothing
End Function

'存储内容到文件
Sub SaveToFile(ByVal strBody,ByVal File)
    Dim objStream
    On Error Resume Next
    Set objStream = Server.CreateObject("ADODB.Stream")
    If Err.Number=-2147221005 Then
        Response.Write "<div align='center'>非常遗憾,您的主机不支持ADODB.Stream,不能使用本程序</div>"
        Err.Clear
        Response.End
    End If
    With objStream
        .Type = 2
        .Open
        .Charset = "GB2312"
        .Position = objStream.Size
        .WriteText = strBody
        .SaveToFile Server.MapPath(File),2
        .Close
    End With
    Set objStream = Nothing
End Sub


用流(stream)技术做下载   

function dl(f,n)
on error resume next
Set S=CreateObject("Adodb.Stream")
S.Mode=3
S.Type=1
S.Open
S.LoadFromFile(f)
if Err.Number>0 then
  Response.Status="404"
else
  Response.ContentType="application/octet-stream"
  Response.AddHeader "Content-Disposition:","attachment; filename=" & n
  Range=Mid(Request.ServerVariables("HTTP_RANGE"),7)
  if Range="" then
   Response.BinaryWrite(S.Read)
  else
   S.position=Clng(Split(Range,"-")(0))
   Response.BinaryWrite(S.Read)
  End if
end if
Response.End
end function

函数使用示例：
call dl(Server.MapPath("../download/07.zip"),"07.zip")