>Is there any reason to choose Encrypted when I build My application? I realise that Encrypted or not REFOX works well :o(((, But when I not choose Encrypted WINRAR build an file 3 times smaller the when I choose Encrypted.

An alternative is Konxise, by the same people that produce Refox. It first compresses the unencrypted executable (to about a third) and then encrypts the compressed file. So you get the advantage of compression and some security for your code. I am sure someone will figure out a way to defeat it, but for the time being I feel better.