Eliminate/replace call to function mime_content_type()

When attempting to export a financial batch to either CSV or IIF format, I get the following error:

Fatal error: Call to undefined function mime_content_type() in /home/dev18/public_html/sites/all/modules/civicrm/CRM/Financial/BAO/ExportFormat.php on line 138

( The URL to the page is: http://mygroup.org/civicrm/financial/batch/export?batch_id=4&export_format=CSV&reset=1 )

Looks like a similar issue occurred with Drush, as the function "mime_content_type" has been deprecated, and is no longer shipped with some builds of PHP 5.3. That solution is documented at: http://drupal.org/node/1458416