It was not one of Explorer's design goals to provide a Turing-complete interface for bulk file renaming
Somebody wanted to append an extension to all files in a directory and couldn't find a way to do this type of bulk rename in Explorer. On the other hand, it's pretty simple from the command prompt: The person then asked, "Can we get this and other multi-file operations added to Explorer?" "There should be a way to rename a large number of fi...