Changing DFS replication folder properties using dfsutil.exe

I have a DFS share which isn't replicating .bak and .tmp files , In order to fix that I need to add  "," in the file filter of the "Replicated Folder" properties.

I am looking for a way to do it via command line, either using DFSUTIL.exe or anything else. So far I have not gotten anywhere.

Please advice a way where I can add/remove the extensions via command line.