默认点击下载pdf等文件而不是在浏览器中打开

<%
Dim Stream
Dim Contents
Dim FileName
Dim FileExt
Const adTypeBinary = 1
FileName = Request.QueryString("FileName")
if FileName = "" Then
    Response.Write "无效文件名."
    Response.End
End if
' 下面是不希望下载的文件
FileExt = Mid(FileName, InStrRev(FileName, ".") + 1)
Select Case UCase(FileExt)
    Case "ASP", "ASA", "ASPX", "ASAX", "MDB"
        Response.Write "受保护文件,不能下载."
        Response.End
End Select
' 下载这个文件
Response.Clear
Response.ContentType = "application/octet-stream"
Response.AddHeader "content-disposition", "attachment; filename=" & FileName
Set Stream = server.CreateObject("ADODB.Stream")
Stream.Type = adTypeBinary
Stream.Open
Stream.LoadFromFile Server.MapPath(FileName)
While Not Stream.EOS
    Response.BinaryWrite Stream.Read(1024 * 64)
Wend
Stream.Close
Set Stream = Nothing
Response.Flush
Response.End
%>
使用：Download.asp?FileName=/Files/MY.doc
把你的DOC文件放到根目录Files下，你也可以放到其它地方了。

如：
<A HREF="Download.asp?FileName=/Files/MY.doc">点击下载WORD文档</A>