Judd, I since the files is Open in Memory (in SW) I believe it would be impossible to rename it.
Hi Judd, as Adrian says I don't think it will be possible to rename the file on Save using Dispatch as it is still in memory. If you want to use Dispatch you can always rename the file on check-in or on a workflow transition.
I'm curious that if you want to add a prefix to the filename, why isn't your serial number set up with the prefix? Unless of course the prefix needs to be different every time?
I am in the same situation where i would like to have 2 different departments use the same serial number. One will have the SD prefix and one will have an OEM prefix. So there may be an SD9998 and then OEM9999 I am trying to figure out the best way to do this.