Problemer med download af fil i mozilla firefox

Hej
Jeg henter kun en tom fil når jeg vil downloade en fil i mozilla firefox. Jeg har oplevet samme problem hvis Nortons firewall er slået til.
I andre browsere virker det perfekt.

Her er koden på siden:
<a href="http://www.mitdomæne.dk/wordfil.asp?fil=\selvefilen.doc">

Og den anden fil:
<%
'--------------------------------------------
Response.Buffer = True
Dim strFilePath, strFileSize, strFileName

Const adTypeBinary = 1

strFilePath = "f:\home\mitdomæne\filerne"
strFileName = Request.QueryString("fil")

Response.Clear

'8*******************************8
' Requires MDAC 2.5 to be stable
' I recommend MDAC 2.6 or 2.7
'8*******************************8
Set objStream = Server.CreateObject("ADODB.Stream")
objStream.Open
objStream.Type = adTypeBinary
objStream.LoadFromFile strFilePath & strFileName

strFileType = lcase(Right(strFileName, 4))

' Feel Free to Add Your Own Content-Types Here
Select Case strFileType
Case ".pdf"
ContentType = "application/pdf"
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 ".asp"
ContentType = "text/asp"
Case Else
'Handle All Other Files
ContentType = "application/octet-stream"
End Select


Response.AddHeader "Content-Disposition", "attachment; filename=" & strFileName
Response.AddHeader "Content-Length", strFileSize
' In a Perfect World, Your Client would also have UTF-8 as the default
' In Their Browser
Response.Charset = "UTF-8"
Response.ContentType = ContentType

Response.BinaryWrite objStream.Read
Response.Flush

objStream.Close
Set objStream = Nothing

%>