help force filedownload

 <% 
call downloadFile(replace(replace(Request("file"),"\",""),"/",""))
function downloadFile(strFile)

strFilename = server.MapPath(strFile)

Response.Buffer = True
Response.Clear
Set s = Server.CreateObject("ADODB.Stream")
s.Open

s.Type = 1

on error resume next


Set fso = Server.CreateObject("Scripting.FileSystemObject")
if not fso.FileExists(strFilename) then
 Response.Write("<h1>Error:</h1>" & strFilename & " does not exist<p>")
 Response.End
end if

Set f = fso.GetFile(strFilename)
intFilelength = f.size
 
s.LoadFromFile(strFilename)
if err then
 Response.Write("<h1>Error: </h1>" & err.Description & "<p>")
 Response.End
end if

Response.AddHeader "Content-Disposition", "attachment; filename=" & f.name
Response.AddHeader "Content-Length", intFilelength
Response.Charset = "UTF-8"
Response.ContentType = "video/avi"<===== the file that i want to download above 4MB is avi (mp3 doesn't work either)

Response.BinaryWrite s.Read
Response.Flush

s.Close
Set s = Nothing

end function
%>
 

on error resume next