RENAME a file and MODIFY his name

Hi my fellows camrades,

I have a question that seems really simple but it's quite a pain in my ass right now.

I had to rename (take a file from a directory and move it to another) which is a .hl7. Whenever this file has been displaced, I have to change the extension from .hl7 to .OK without using the rename method. Maybe using the attribut?

Do you have any ideas how I could do it?

This should follow the step i have explained right before.

I have a service to take the file but i need an operation to rename it then change his name.

Thanks in advance for your help,

Thomas