Dans le fichier de configuration, il y a

// +-----------------------------------------------------------------------+
// |                                 urls                                  |
// +-----------------------------------------------------------------------+

// question_mark_in_urls : the generated urls contain a ? sign. This can be
// changed to false only if the server translates PATH_INFO variable
// (depends on the server AcceptPathInfo directive configuration)
$conf['question_mark_in_urls'] = true;

// php_extension_in_urls : if true, the urls generated for picture and
// category will not contain the .php extension. This will work only if
// .htaccess defines Options +MultiViews parameter or url rewriting rules
// are active.
$conf['php_extension_in_urls'] = true;

// category_url_style : one of 'id' (default) or 'id-name'. 'id-name'
// means that an simplified ascii represntation of the category name will
// appear in the url
$conf['category_url_style'] = 'id';

// picture_url_style : one of 'id' (default), 'id-file' or 'file'. 'id-file'
// or 'file' mean that the file name (without extension will appear in the
// url). Note that one aditionnal sql query will occur if 'file' is choosen.
// Note that you might experience navigation issues if you choose 'file'
// and your file names are not unique
$conf['picture_url_style'] = 'id';

// tag_url_style : one of 'id-tag' (default), 'id' or 'tag'.
// Note that if you choose 'tag' and the url (ascii) representation of your
// tags is not unique, all tags with the same url representation will be shown
$conf['tag_url_style'] = 'id-tag';