Content Type Problem in Internet Explorer 7

This codes forces Google Chrome to download the file as .aspx and for IE7 as .htm

    Dim sFileString As String = HttpContext.Current.Request("FileString")
    If Not String.IsNullOrEmpty(sFileString) Then
        Dim bBuffer() As Byte = System.Text.Encoding.ASCII.GetBytes(sFileString)
        Response.ClearContent()
        Response.ContentType = "application/text"
        Response.ClearHeaders()
        Response.AddHeader("Content-Disposition", "attachment")
        Response.AddHeader("Filename", "ACHFile.txt")
        Response.OutputStr开发者_运维知识库eam.Write(bBuffer, 0, bBuffer.Length)
    End If

I want it to download the file as .txt but didn't make it.

I believe you should use text/plain

See:

MIME Type Detection in Internet Explorer

http://msdn.microsoft.com/en-us/library/ms775147(v=vs.85).aspx

How To Raise a "File Download" Dialog Box for a Known MIME Type http://support.microsoft.com/kb/260519

Update:

Also try

Response.AppendHeader("Content-Type", "application/force-download;");