If I archive a site that has slashes on the ends of the URLs then HTTrack saves
each page as an index.html. e.g. a URL like:

    <http://example.org/dir/>

is saved as:

    example.org/dir/index.html

But if a site doesn't have slashes on the end, and no file extension, then
HTTrack assumes it's a file. So that:

    <http://example.org/dir>

is saved as:

    example.org/dir.html

In this case I'd like it to work as it did when there was a trailing slash.

Is there a way to say to HTTrack "Assume any URL without a file extension is a
directory"?