How do I allow uploading of additional formats

From PaulGuWiki

MediaWiki requires that allowed file upload formats are specified using the $wgFileExtensions configuration directive. Usually this directive is situated in LocalSettings.php in the root of your MediaWiki installation.

For example, to allow uploading of PDF files, add the following to LocalSettings.php:

$wgFileExtensions[] = 'pdf';

Note: The syntax is different to allow uploading of more than one type of file. To do so, use an array as in the example below which will allow uploading of png, gif, jpg, jpeg, pdf, and txt files.

$wgFileExtensions = array( 'png', 'gif', 'jpg', 'jpeg', 'pdf', 'txt' );