在新窗口下载文件

<%
Response.Buffer=true
取得要下载的文件，如果不为空。就下载
dim url,trueurl
url="下载文件路径和下载文件名"
fname=Request("filename")
if fname<>"" then
trueurlurl=server.MapPath("/") &url
end if
set objFso=server.CreateObject("scripting.filesystemobject")
set fn=objFso.GetFile(trueurl)
flsize=fn.size
flname=fn.name
set fn=nothing
set objFso=nothing

set objStream=server.CreateObject("adodb.stream")
objStream.Open
objStream.Type=1
objStream.LoadFromFile url

select case lcase(right(flname,4))
case ".asf"
ContentType="video/x-ms-asf"
case ".avi"
ContentType="video/avi"
case ".doc"
ContentType="application/msword"
case ".zip"
ContentType="application/zip"
case ".xls"
ContentType="application/vnd.ms-excel"
case ".gif"
ContentType="image/gif"
case ".jpg","jpeg"
ContentType="image/jpeg"
case ".wav"
ContentType="audio/wav"
case ".mp3"
ContentType="audio/mpeg3"
case ".mpg", "mpeg"
ContentType="video/mpeg"
case ".rtf"
ContentType="application/rtf"
case ".htm","html"
ContentType="text/html"
case ".txt"
ContentType="text/plain"
Case ".ASP", ".ASA", "ASPX", "ASAX", ".MDB"
Response.Write "受保护文件,不能下载."
Response.End
case else
ContentType="appliation/octet-stream"
end select

Response.AddHeader "Content-Disposition", "attachment; filename="&flname
Response.AddHeader "Content-Length", flsize
Response.CharSet="UTF-8"
Response.ContentType=ContentType
Response.BinaryWrite objStream.Read
Response.Flush
Response.Clear()
objStream.Close
set objStream=nothing
%>