BFile::correctFileName

protected function correctFileName($fileName)
{
	$fileName = Path::replaceInvalidFilename($fileName, function(){
		return '_';
	});

	$correctedFileName = preg_replace('~x{00a0}~siu', ' ', $fileName);
	if($correctedFileName !== null)
	{
		$fileName = $correctedFileName;
	}

	return $fileName;
}