PHPMailer : Cant send attachement - file

Question

I have a probleme with PHPMailer .
First i used it without FTP , but all email was SPAM .
So i tried to use my FTP login and now all email are not junk .
But problem ... my attachement ( .rar and . zip ) doest work .
i tried with txt files and its ok ... i'm becoming crazy
require('class.phpmailer.php');
$mail = new PHPMailer();
$mail->CharSet = "UTF-8";
$mail->SMTPDebug = 1;
$mail->IsSMTP();
$mail->Host = "r******";
$mail->Port = "465";
//usually the port for TLS is 587, for SSL is 465 and non-secure is 25
$mail->SMTPSecure = "ssl";
//TLS, SSL or delete the line
$mail->SMTPAuth = true;
$mail->Username = 's*****';
$mail->Password = '##';
$mail->From = 'sales#*****';
$mail->FromName = '****';
$mail->AddAddress("$payer_email", "$payer_business_name");
$mail->Subject = "SUBJET";
$mail->Body = " MY MESSAGE";
if( $custom == 1 )
{
$mail->AddAttachment('test.txt');
}
if( $custom == 2 )
{
$mail->AddAttachment('test2.txt');
}
$mail->Send() ;
}
}
fclose ($fp);
}
i use if and else because its a paypal button with param . ( if 1 i send this file by mail )
this is working with txt files . but not with RAR or ZIP files ... No email send
any idea ?
thanks a lot