I'm working with a third party who is supplying XML files on a regular basis and they require me to be able to import files where the filename has increased (e.g. orders 08032007, orders 09032007, etc).

Conversely I want to be able to export files where I've added a timestamp to the filename on export.

I do, of course, want to automate this routine with a script.

Is this something I can do in FP8.5 or is there a plug-in that may do the trick?

Can anyone advise?

You could use a plugin to rename the files before and after import/export to and from a generic filename.

I could make you an example script using my free MooPlug plugin if you wanted?

Why don't you simply use a script variable to set the file path ? and increment it with a loop until it succeeds ?