Maybe I can add opton to use negative file masks, so you can specify something like "!*/_darcs/*" to force binary mode for all files in _darcs directory.

When starting out with the Darcs revision control system, specifically when following the Darcs Wiki instructions its very tempting to just drag a remote _darcs directory with WinSCP from a Unix server to a local development drive. The problem with this is that the Automatic settings are not ideal for this particular directory, it should be binary. And preferably, all edits should be done with emacs, and definitely not notepad, to avoid ctrl-m style carriage returns on local edits. With these caveats, a darcs push will succeed fairly well. Its difficult enough getting started with darcs and getting a mindset for applying patches properly, and so having WinSCP detect directories named _darcs so as to transfer them as Binary when on the default Automatic setting, would be a step in the right direction.