Attempting to download the latest build from the command line, I was unable to use filename completion. Thought I'd found a new bug; nope, just a configuration error. I had UnixPaths=NO. Fixed that, everything worked as expected. Suggest that whenever file completion is attempted on an internet file, i.e. anything beginning with xxx:// then forward slashes should be handled as if UnixPaths=YES, regardless of the current setting.