You will need Tcl at the Outbound Tps. If you have never written such a proc to change file name, I have one you can use as a start. Email me if you want that.
Do you want the name to change at a certain time on a given day of the week?
Are the files created daily, weekly, etc.?
email: jim.kosloskey@jim-kosloskey.com 29+ years Cloverleaf, 59 years IT - old fart.