Change file name of ACH Plug-In created file

Is there a way to have the ACH file that is created with the ACH Plug in have a branch specific name?  Our client has multiple companies with multiple bank accounts.  When they create the ACH export using the plug in the file is created as ‘ACHmmddyy.txt.  Client would like to know if there is a way to change that so it indicates the branch name also as when they process multiple payments on the same day and download them to their computer they have no way of knowing which bank account they are uploading the file for unless they open it up first.