Bulk/Batch rename files and file extensions on Windows using cmd.exe.
You have a folder full of saved pcap files however you forgot to add the file extension when you created your capture configuration. Open a cmd.exe and navigate to the folder. In this example the folder is located at C:\pcaps.
You want to add the extension .pcap to each file. Execute the following command.
C:\pcaps>ren *. *.pcap