>Any one knows what algoritm use sys(2015) or sys(3) to generate the names?
>I need to find this kind of temp files in a hard drive to delete them.

You should really make sure you are deleting only files which your application is creating - and if it is creating them, make sure it is putting them in one directory and have your app clean up when run. I would not want to be responsible for deleting important files on a users harddrive just because they looked like temp files from my application.