I added the capability to upload Flipcharts to the site through a network active plugin written to add the mime type.
/**
* Plugin Name: Adding Flipchart Mime
* Plugin URI:
http://www.thechembook.com
* Description: This custom plugin adds uploading flipchart capability to WordPress.
* Author: Layne P. Heiny
* Author URI:
http://www.layneheiny.com
* Version: 0.1.0
*/
add_filter('upload_mimes','flip_upload_mimes');
function flip_upload_mimes($mimes)
{
$mime_types = array...
