i m looking for a program to create workflow, what i need :
i need scan directory, if a files is putting on this directory, mail is send to user to get is validation of the files, when the user valide the files, the files is moving in other directory, and i he refused the files is move on failed directory,
Well I can't answer it. You stated 'mail is sent to user to get is validation' I'm just replying to what you defined as your workflow.
This is where you need to start trying somethings (and it is the best way to learn)
If you want an email to have a link to the file, you will need to think about security. Where will NR be running, If the user that needs to validate the file is traveling will you allow them to securily access your internal network (assuming that NR is running on a local lan) to look at the file and prevent 'bad guys' from accessing.
These are somethings youneed to decide on and investigate before you start coding.
p.s. if you search the forum for 'security' you will find this has come up a lot.