You've just misunderstood the meaning of "multiple dot file".
examples of multiple dot file:
- 123.zip.rar
- 123..zip
The reason why Protector prohibits multiple dot file, these files can be used for attacking.
- malicious.php.unknownextension
This file can be parsed and executed as a PHP script.
Protector never prohibits "multiple file uploading".
OK Gijoe, I understand now.
Thank's.