Alter archiver information declared by other modules.
See hook_archiver_info() for a description of archivers and the archiver information structure.
$info: Archiver information to alter (return values from hook_archiver_info()).
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_archiver_info_alter(&$info) {
$info['tar']['extensions'][] = 'tgz';
}