Problem with file download/Response.AddHeader in IE

I have the following statement in my ASP page:

<a href="DownloadFile.asp?File=<%= Server.URLEncode(myFile.Name) %>"><% Response.Write myFile.Name %></a>

On clicking the link, the code on DownloadFile.asp (see below) uses a request.querystring to retrieve the name of the file. When I click on the link in Firefox, the Save As/Open dialog box opens with the correct filename and if I click Save, it saves the file correctly. eg: myfile08.txt

But when I click on one of the link in IE, it opens the Save As/Open dialog box but asks if I want to Save/Download the file "DownloadFile_asp?File=myfile08_txt"

I am baffled. I know the correct filename is getting passed as indicated by my Response.Write strClientFileName statement at the beginning of the DownloadFile.asp page.

Also, the inline option works perfectly:
   
    Call Response.AddHeader("Content-Disposition", "inline; filename=" & strClientFileName)

but
   
    Call Response.AddHeader("Content-Disposition", "attachment; filename=" & strClientFileName)

only works in Firefox. IE can't seem to figure out what to do with it. Do I have to set up the MIME type in IIS? Why does it work in Firefox then?Start Free Trial

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strClientFileName = Request.QueryString("File")
	
Response.Write strClientFileName
	
strServerFilePath = conDownloadFolder & "\" & strClientFileName
	
strMIMEContentType = "text/plain"
 
	
Set objFS = Server.CreateObject("Scripting.FileSystemObject")
Set objStream = objFS.OpenTextFile(strServerFilePath, 1)
strFileData = objStream.ReadAll()
Call objStream.Close()
Set objStream = Nothing
Set objFS = Nothing
	
	If Response.Buffer Then
		Call Response.Clear
		Response.Buffer = False
	End If
	
	Response.Expires = -100
	Response.CacheControl = "no-cache"
	Response.ContentType = strMIMEContentType
	Call Response.AddHeader("Pragma", "no-cache")
Call Response.AddHeader("Content-Disposition", "attachment; filename=" & strClientFileName)
	
'this works inline
'Call Response.AddHeader("Content-Disposition", "inline; filename=" & strClientFileName)
	
Call Response.Write(strFileData)
	
Session("HttpDownload.TransferSeconds") = DateDiff("s", dtTransferStart, Now())