SharePoint @ Big Scholar

Here's a handy little function to get the mime type of a particular file.

         private string getMimeType(string Filename)
        {
            string mime = "application/octetstream";
            string ext = System.IO.Path.GetExtension(Filename).ToLower();
            Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
            if (rk != null && rk.GetValue("Content Type") != null)
                mime = rk.GetValue("Content Type").ToString();
            return mime;
        }

You never know when it could come in handy.