pdf ContentType not displaying

[mwa]

I have an application that uses the following to display a PDF document:

MyFileStream = New FileStream(HttpContext.Current.Session("filePath"), FileMode.Open, FileAccess.Read, FileShare.Read)

            FileSize = MyFileStream.Length

            Dim Buffer(CInt(FileSize)) As Byte
            MyFileStream.Read(Buffer, 0, CInt(FileSize))
            MyFileStream.Close()

            HttpContext.Current.Response.ContentType = "application/pdf"
            HttpContext.Current.Response.OutputStream.Write(Buffer, 0, FileSize)
            HttpContext.Current.Response.Flush()
            HttpContext.Current.Response.Close()

This works for most users, but I have a few users that report that they get a File Download dialog with the message:
"Do you want to save this file, or find a program online to open it?" It then lists
Name: Export.aspx
Type: Unknown File Type
From: myWebsiteUrl.com

Any ideas how to resolve this issue for these specific users? All are using Windows XP, Reader 7+, and IE7+

Thanks!

mwa
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[jmeckley]

HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=[put name of file here].pdf");

Jason Meckley
Programmer
Specialty Bakers, Inc.