>>What Backup or ?
>>this posibible to Decomple Complete
>
>If you own the application and your are the developper of the application, than you should have a backup of the source code. No need to decompile. But if you are not the programmer that created the application, then what you are trying to do is illegal.

Incorrect. If you are the owner (of the intellectual rights) or have permission of the owner of the program you have every right to decompile it.
Too many people asume that if you are the programmer, you hold the intellectual right. In most cases that is not true.